The ambition of the paper is to provide a solution to the problem posed by Von Wright (1999): how is it possible that the two actions, one of producing P and the other of preventing P can have different deontic status, the former being obligatory and the latter being forbidden. The solution for the problem is sought for by an investigation into connections between imperative and deontic logic. First, it is asked whether a solution could be found in Lemmon's (1965) (...) system of "change logic", using his idea on connection between logic of orders being in force and deontic logic. The answer is the negative one. Next, the connection between Lemmon's imperative logic and deontic logic given in Aqvist's paper - "Next" and "Ought" (1965) - is analyzed. Than, the Lemmon's treatment of imperatives is restricted to the natural language imperatives and Aqvist's way of connecting imperative and deontic logic is modified accordingly. Some principles for the natural language imperatives are established (the negation rule ; the law of contraposition for imperative conditionals) and a simple "global" semantics is developed. The notion of "opposite action" is introduced and it is given an important role in semantics. Finally, a solution for von Wright's problem is given. In the closing sections some further topics for investigation are hinted: one of them being the connection between Aqvist's epistemic- imperative conception of interrogatives and "epistemic obligations", the other being formalization of the idea that imperatives create and re-create obligation patterns that can be described in deontic terms. (shrink)

In this paper, the set-theoretic approach in the logical theory of normative systems is extended using Broome’s definition of the normative code function. The syntax and semantics for first order metanormative language is defined, and metanormative language is applied in the formalization of the basic principles in Broome’s approach and in the construction of a logical typology of normative systems. Special attention is given to the types of normative systems which are not definable in terms of the properties of singular (...) sets of requirements (e.g. the realization equivalence of codes, the social compatibility of codes, and the compatibility of codes issued by different normative sources). Examples are given of the application of the typology in the interpretation of philosophical texts. Von Wright’s hypothesis on the connection of logical properties of normative systems, conceived set-theoretically, with standard deontic logic is proved by introducing the translation function between the metanormative language and the restricted language of standard deontic logic. The translation reveals that von Wright’s hypothesis must be appended. The problems of narrow and wide scope readings of the deontic conditionals and of the meaning of iterated deontic operators are addressed using the distinction between relative and absolute normative codes. The theorem on the existence of a realization equivalent absolute code for any relative code is proved. (shrink)

We argue that intentions are beliefs—beliefs that are held in light of, and made rational by, practical reasoning. To intend to do something is neither more nor less than to believe, on the basis of one’s practical reasoning, that one will do it. The identification of the mental state of intention with the mental state of belief is what we call strong cognitivism about intentions. It is a strong form of cognitivism because we identify intentions with beliefs, rather than maintaining (...) that beliefs are entailed by intentions or are components of them. (shrink)

At the starting point of the article, the author considers the current process of fragmenting ethics into numerous special ethics as a process of destroying ethics as a philosophical discipline. He relates this to the historical failure of ethics, which due to categorical limitations could not address the challenges of the advanced scientific-technical civilisation, resulting in an “ethical vacuum” (H. Jonas). In response to the ethical vacuum, a number of ethical initiatives have emerged which the author, according to the effects (...) on the rehabilitation of the role of traditional ethics and on the creation of a new orientational framework, classifies on a destructive and a productive line. On the productive line of overcoming the ethical vacuum, bioethics has emerged which, along with other ethical projects, has created a new orientational atmosphere that the author calls “a new ethical culture”. On the destructive line, along with the inflation of special ethics, a special form of destruction has emerged in terms of implanting “applied ethics”, which the author refers to as a nonsensical concept, into the fabric of traditional ethics. Then, the author presents three main problems of applied ethics. The first is of a substantial nature and consists in the fact that applied ethics does not have and in principle cannot have unquestionable norms as an object of application. The second main problem is of a methodological nature and consists in the inappropriateness and non-acceptance of deductivism as a model of applying ethical norms to practice. The third main problem is of a usage nature and consists in developing the myth of the practicality of applied ethics. The author concludes that applied ethics is neither an ethical concept nor an ethical project but a market brand which on the ethical terrain turns out to be nonsense. In the conclusion of the article, the author argues that applied ethics became an institution of ethical absurdity the moment it, as an empty marketing label, took over the vacancy of the object of application and the role of general ethics for an unrelated and undefined conglomerate of special ethics transformed into its branches. (shrink)

Le concept de volonté générale de Rousseau est présenté par l`auteur comme le fondement catégoriel de la compréhension moderne de la démocratie, et sa transposition d`un contexte naturel légal dans un contexte social, ainsi que la légitimation de la vie sociale et politique est prise comme une ligne de partage qui scinde l`histoire de la démocratie en deux époques. Dans la première partie de l`article l`auteur se base sur les explications de Hérode, Platon et Aristote pour reconstruire l`histoire ancienne du (...) concept de démocratie. Il passe ensuite aux changements essentiels dans la conception et le rôle réel de la démocratie qui se sont manifestés au siècle de la Révolution française, il distingue la volonté générale de la volonté commune pour établir la dimension morale de la démocratie, et sous cet aspect il se concentre sur la philosophie politique de Rousseau. En conclusion il se penche sur la partitocratie qui n`est qu`une forme d`aberration de la démocratie tout en se limitant au type transitoire de la partitocratie systématique qui apparaît dans le cadre du phénomène historique du postcommunisme. Dans ce contexte, à la théorie dominante de la transition l`auteur oppose la théorie du chaos postcommuniste qui est envisagée comme une approche théorique alternative de l`explication des événements postcommunistes. (shrink)

Name der Zeitschrift: Nietzscheforschung Jahrgang: 24 Heft: 1 Seiten: 283-294.

We take a tremendous interest in how other people think of us. We have certain expectations of others, concerning how we are to figure in their thought and judgment. And we often feel wronged if those are disappointed. But it is puzzling how others’ beliefs could wrong us. On the one hand, moral considerations don’t bear on the truth of a belief and so seem to be the wrong kind of reasons for belief. On the other hand, truth-directed considerations seem (...) to render moral considerations redundant. In this paper, we argue that to understand the possibility of doxastic wronging, we need to understand beliefs, no less than actions, as ways of relating to one another. In particular, how we take account of what others think and say will depend on whether we take up what P. F. Strawson calls the participant stance toward them. We show how this helps to make sense of an example Miranda Fricker identifies as a case of epistemic injustice. We then use the example to spell out the ethical significance of Tyler Burge’s idea that we have a default entitlement to accept at face value what we receive from a rational source. (shrink)

Existentialist philosophy has, at times, been exceptionally popular. This is because of its promise of possibility, both in doctrine and in style: Its doctrine promises that we can break free from the shackles of cognitive or social structures we are thrown into, and we can overcome our marred personal or collective history. Its style promises that philosophy can be exciting, moving, exhilarating, and funny. Analytic Existentialism brings together ten essays in which analytic philosophers engage with existentialism. The essays take up (...) central existentialist themes, such as freedom, consciousness, and bad faith. Some bring existentialist ideas to bear on issues in contemporary analytic philosophy; some engage analytically with existentialist concerns; some employ the methods of analytic philosophy to interpret existentialist texts; and some articulate how existentialist insights speak to ongoing matters of concern outside of philosophy. All essays, taken together, make good on the existentialist promise for analytic philosophy: Even as analytic philosophers, we can embrace the thought that freedom is at the heart of our being. And even as analytic philosophers, we can write philosophical texts that capture the imagination. We trust that these essays can rekindle the excitement of philosophical thought. (shrink)

Suppose you decide or promise to do something that you have evidence is difficult to do. Should you believe that you will do it? On the one hand, if you believe that you will do it, your belief goes against the evidence—since having evidence that it’s difficult to do it constitutes evidence that it is likely that you won’t do it. On the other hand, if you don’t believe that you will do it but instead believe, as your evidence suggests, (...) that it is likely that you will fail, your decision is not serious and your promise is not sincere. This problem—I call it the Epistemological Problem of Difficult Action—is a pressing philosophical problem that each of us faces. In this paper I consider several possible responses to it. I conclude that the right response is to say that we should believe against the evidence. Cases in which we decide or promise to do something that we have evidence is difficult to do are the best counterexamples to evidentialism. (shrink)

This paper proposes to reorient the philosophical debate about peer disagreement. The problem of peer disagreement is normally seen as a problem about the extent to which disagreement provides one with evidence against one's own conclusions. It is thus regarded as a problem for individual inquiry. But things look different in more collaborative contexts. Ethical norms relevant to those contexts make a difference to the epistemology. In particular, we argue that a norm of mutual answerability applies to us when we (...) engage in shared inquiry with others, and precludes us from treating one another's conflicting judgments as evidence relevant to the dispute. From this it follows that standard philosophical accounts of peer disagreement—e.g., the Equal Weight View and the Total Evidence View—presuppose that the disagreeing parties are in a sense alienated from one another. It's doubtful that such forms of alienated disagreement should be treated as the central case. (shrink)

How does evidence figure into the reasoning of an agent? This is an intricate philosophical problem but also one we all encounter in our daily lives. In this chapter, we identify the problem and outline a possible solution to it. The problem arises, because the fact that it is up to us whether we do something makes a difference to how we should think of the evidence concerning whether we will actually do it. Otherwise we regard something that is up (...) to us as if it were not: We regard something that is up to us as if it were the outcome of a lottery. Nonetheless, we would be wrong to ignore the evidence. Otherwise we could not make a rational decision. In this chapter, we first show that a decision-theoretic approach to this problem cannot succeed. This approach does not explain how we can take evidence into account in practical reasoning without making predictions concerning matters that are up to us. It also gives rise to incoherence between our practical and our theoretical conclusions. We then argue that what is required to solve the problem is recognizing that beliefs about matters that are up to us can be grounded in practical reasoning. We argue that such beliefs are not subject to an evidential norm, because they are not meant to reflect a reality that is independent of them but instead are meant to bring about the reality they represent. Finally, we argue that, even if we are fully rational agents, we will sometimes lack practical knowledge of what we will do. That is because when it is practically rational to do something that will require resolve, we may be in a position to rationally conclude that we will do it, even though we have evidence that there is a non-negligible chance that we won’t. In such cases, our evidence serves as a defeater for our practical knowledge. (shrink)

In this paper ontological implications of the Barcan formula and its converse will be discussed at the conceptual and technical level. The thesis that will be defended is that sentential moods are not ontologically neutral since the rejection of ontological implications of Barcan formula and its converse is a condition of a possibility of the imperative mood. The paper is divided into four sections. In the first section a systematization of semantical systems of quantified modal logic is introduced for the (...) purpose of making explicit their ontological presuppositions. In this context Jadacki's ontological difference between being and existence is discussed and analyzed within the framework of hereby proposed system of quantified modal logic. The second section discusses ontological implications of the Barcan formula and its converse within the system accommodating the difference between being and existence. The third section presents a proof of incompatibility of the Barcan formula and its converse with the use of imperatives. In the concluding section, a thesis on logical pragmatics foreclosing the dilemma between necessitism and contingentism is put forward and defended against some objections. (shrink)

We often promise to ϕ despite having evidence that there is a significant chance that we won’t ϕ. This gives rise to a pressing philosophical problem: Are we irresponsible in making such promises since, it seems, we are insincere or irrational in making them? I argue that we needn’t be. When it’s up to us to ϕ, our practical reasons for ϕ-ing partly determine whether it is rational for us to believe that we will ϕ. That is why we can (...) sometimes rationally believe that we will ϕ even if our belief goes against the evidence. (shrink)

This paper is divided in five sections. Section 11.1 sketches the history of the distinction between speech act with negative content and negated speech act, and gives a general dynamic interpretation for negated speech act. “Downdate semantics” for AGM contraction is introduced in Section 11.2. Relying on semantically interpreted contraction, Section 11.3 develops the dynamic semantics for constative and directive speech acts, and their external negations. The expressive completeness for the formal variants of natural language utterances, none of which is (...) a retraction, has been proved in Section 11.4. The last section gives a laconic answer to the question posed in the title of the paper. (shrink)

In the First Meditation, the Cartesian meditator temporarily concludes that he cannot know anything, because he cannot discriminate dreaming from waking while he is dreaming. To resist the meditator’s conclusion, one could deploy an asymmetry argument. Following Bernard Williams, one could argue that even if the meditator cannot discriminate dreaming from waking while dreaming, it does not follow that he cannot do it while awake. In general, asymmetry arguments seek to identify an asymmetry between a bad case that is entertained (...) as a ground for doubt and a good case in which one takes oneself to know something. My aim in this paper is to consider how effective asymmetry arguments are as an anti-skeptical strategy. I conclude that although asymmetry arguments provide an effective response to dreaming skepticism, they fail as a response to brains-in-a-vat skepticism. (shrink)

It is common to think of the attitude of trust as involving reliance of some sort. For example, Annette Baier argues that trust is reliance on the good will of others, and Richard Holton argues that trust is reliance from a participant stance. However, it is puzzling how trust could involve reliance, because reliance, unlike trust, is responsive to practical reasons: we rely in light of reasons that show it worthwhile to rely, but we don’t trust in light of reasons (...) that show it worthwhile to trust. To address the puzzle, I sketch an account of reliance, according to which reliance consists in action, and I sketch an account of trust, according to which trust consists in belief held from a participant stance. I conclude that it is plausible to see trust as the grounds for reliance. (shrink)

The ethics of belief is concerned with the question what we should believe. According to evidentialism, one should believe something if and only if one has adequate evidence for what one believes. According to classic pragmatism, other features besides evidence, such as practical reasons, can make it the case that one should believe something. According to a new kind of pragmatism, some epistemic notions may depend on one’s practical interests, even if what one should believe is independent of one’s practical (...) reasons. In this paper I recount and briefly assess the debate between evidentialism and pragmatism. (shrink)

The author considers the current process of fragmenting ethics into numerous special ethics at the starting point of the article as a process of destroying ethics as a philosophical discipline. He relates this to the historical failure of ethics which due to categorical limitations could not address the challenges of the advanced scientific-technical civilisation, resulting in an “ethical vacuum”. In response to the ethical vacuum, a number of ethical initiatives have emerged which the author, according to the effects on the (...) rehabilitation of the role of traditional ethics and on the creation of a new orientation framework, classifies on a destructive and productive line. On the productive line of overcoming the ethical vacuum, bioethics has emerged which, along with other ethical projects, has created a new orientation atmosphere that the author calls “a new ethical culture”. On the destructive line, along with the inflation of special ethics, a special form of destruction has emerged in terms of implanting “applied ethics”, which the author refers to as a nonsensical concept, into the fabric of traditional ethics. Then the author presents three main problems of applied ethics. The first is of a substantive nature and consists in the fact that applied ethics does not have and in principle cannot have unquestionable norms as an object of application. The second main problem is of a methodological nature and consists in the inappropriateness and non-acceptance of deductivism as a model of applying ethical norms to practice. The third main problem is of a practical nature and consists in developing the myth of the practicality of applied ethics. The author concludes that applied ethics is neither an ethical concept nor an ethical project but a market brand which on the ethical plane turns out to be nonsense. In the point of the article, the author argues that applied ethics became an institution of ethical absurdity the moment it, as an empty marketing label, took over the vacancy of the object of application and the role of general ethics for an unrelated and undefined conglomerate of special ethics transformed into its branches. (shrink)

Skepticism seems to have excessive consequences: the impossibility of successful enquiry and differentiated judgment. Yet if skepticism could avoid these consequences, it would seem idle. I offer an account of moderate skepticism that avoids both problems. Moderate skepticism avoids excessiveness because skeptical reflection and ordinary enquiry are immune from one another: a skeptical hypothesis is out of place when raised with in an ordinary enquiry. Conversely, the result of an ordinary enquiry cannot be used to disprove skepticism. This ‘immunity’ can (...) be explained by theories such as contextualism, or sensitive invariantism. Moderate skepticism avoids idleness, because it can eliminate dogmatic elements from our commitments. An analogy is used to illustrate this: Consider someone who is rootless—someone who doesn't have a home. She won't take this conclusion to undermine her judgment that she is flying home for the holidays—even if she is sleeping in the guest bedroom. Similarly, a skeptic won't take the skeptical conclusion to undermine ordinary claims to know. Yet concluding that one is rootless is significant: it can shape one's commitments; for instance it can check one's nationalism. Similarly, accepting the skeptical conclusion is significant; it can undermine dogmatic commitments and ultimately bring about intellectual catharsis. (shrink)

If we hold that perceiving is sufficient for knowing, we can raise a powerful objection to dreaming skepticism: Skeptics assume the implausible KK-principle, because they hold that if we don’t know whether we are dreaming or perceiving p, we don’t know whether p. The rejection of the KK-principle thus suggests an anti-skeptical strategy: We can sacrifice some of our self-knowledge—our second-order knowledge—and thereby save our knowledge of the external world. I call this strategy the Self-Knowledge Gambit. I argue that the (...) Self-Knowledge Gambit is not satisfactory, because the dreaming skeptic can avail herself of a normative counterpart to the KK-principle: When we lack second-order knowledge, we should suspend our first-order beliefs and thereby give up any first-order knowledge we might have had. The skeptical challenge is essentially a normative challenge, and one can raise it even if one rejects the KK-Principle. (shrink)

Critical examination of Alchourrón and Bulygin’s set-theoretic definition of normative system shows that deductive closure is not an inevitable property. Following von Wright’s conjecture that axioms of standard deontic logic describe perfection-properties of a norm-set, a translation algorithm from the modal to the set-theoretic language is introduced. The translations reveal that the plausibility of metanormative principles rests on different grounds. Using a methodological approach that distinguishes the actor roles in a norm governed interaction, it has been shown that metanormative principles (...) are directed second-order obligations and, in particular, that the requirement related to deductive closure is directed to the norm-applier role rather than to the norm-giver role. The approach has been applied to the case of pure derogation yielding a new result, namely, that an independence property is a perfection-property of a norm-set in view of possible derogation. This paper in a polemical way touches upon several points raised by Kristan in his recent paper. (shrink)

This book is an introduction to elementary logic (classical propositional and first-order logic), comprising brief summaries of the basics of elementary logic, with the emphasis on typical questions and procedure descriptions and with a large number of corresponding exercises and problems. Solutions are given for each problem and exercise, often with commentaries. The first part, Basics of Logic, deals with (a) formal language, models, Venn diagrams for sentences, and translation from natural into formal language and vice versa, (b) deduction and (...) refutation methods in the format of natural deduction (Fitch and Suppes-Lemmon styles), tableau system and Venn diagrams, and (c) basic logical properties and relations (consistency, validity, consequence, equivalence, various types of opposition, logical completeness and independency, relationship between syntax and semantics). The second part, Logic in Understanding and Analysis, introduces into (a) logical approach to problem solving in concrete situations and events as presented in brief tales and anecdotes, (b) discovering the meaning, and reconstruction of logical interconnections, in ordinary, scholarly and philosophical texts, (c) application of already mastered logical tools in examining and defining further theoretical (logical, scientific) concepts and in building formal languages. The shorter third part, From the Traditional Logic, is dedicated to the traditional logic of concepts, judgements and syllogisms, largely with the use of Venn diagrams. (shrink)

Anscombe famously said, “It is an insult and it may be an injury not to be believed.” But what is it to believe someone? My aim is to show that understanding what it is to believe someone requires a conception of a distinctive kind of interpersonal reasoning. To do so, I develop an analogy between interpersonal reasoning and an Anscombean conception of practical reasoning. I suggest that the distinctive ‘form’ of interpersonal reasoning is recognition. I furthermore argue that this is (...) to be understood as a primarily logical, rather than epistemological point. In concluding, I explain why a notion of interpersonal reasoning makes available an ethics of thought and, specifically, an account of testimonial injustice. (shrink)

This discussion note points to some verbal imprecisions in the formulation of the Enhanced Indispensability Argument. The examination of the plausibility of alternative interpretations reveals that the argument’s minor premise should be understood as a particular, not a universal, statement. Interpretations of the major premise and the conclusion oscillate between de re and de dicto readings. The attempt to find an appropriate interpretation for the EIA leads to undesirable results. If assumed to be valid and sound, the argument warrants the (...) rationality of the belief in an unusual variant of Platonism. On the other hand, if taken as it stands, the argument is either invalid or is unsound or does not support the mathematical Platonism. Thus, the EIA in its present form cannot serve as a useful device for the Platonist. (shrink)

The theory of imperatives is philosophically relevant since in building it — some of the long standing problems need to be addressed, and presumably some new ones are waiting to be discovered. The relevance of the theory of imperatives for philosophical research is remarkable, but usually recognized only within the field of practical philosophy. Nevertheless, the emphasis can be put on problems of theoretical philosophy. Proper understanding of imperatives is likely to raise doubts about some of our deeply entrenched and (...) tacit presumptions. In philosophy of language it is the presumption that declaratives provide the paradigm for sentence form; in philosophy of science it is the belief that theory construction is independent from the language practice, in logic it is the conviction that logical meaning relations are constituted out of logical terminology, in ontology it is the view that language use is free from ontological commitments. The list is not exhaustive; it includes only those presumptions that this paper concerns. (shrink)

There is often something wrong with merely promising to try to φ. In this article I explain what is wrong with such promises. I argue that a promise to try to φ, when it is entirely up to us to φ, is always wrong because it hides a possible choice under the veil of our susceptibility to circumstances beyond our control. I furthermore argue that this is often also the case when matters are not entirely up to us. Finally, I (...) contend that sometimes the promise to try places undue burdens on the promisee. (shrink)

SOCREAL 2013 : 3rd International Workshop on Philosophy and Ethics of Social Reality 2013. Hokkaido University, Sapporo, Japan, 25-27 October 2013. Session 2 : Imperatives and Norms.

Evidence and Agency is concerned with the question of how, as agents, we should take evidence into account when thinking about our future actions. Sometimes we promise and resolve to do things that we have evidence is difficult for us to do. Should we believe that we will follow through, or believe that there is a good chance that we won't? If you believe the former, you seem to be irrational since you believe against the evidence. Yet if you believe (...) the latter, you seem to be insincere since you can't sincerely say that you will follow through. Hence, it seems, your promise or resolution must be improper. To meet this challenge, Berislav Marušić considers and rejects a number of responses, before defending instead a solution inspired by the Kantian tradition and by Sartre in particular: as agents, we have a distinct view of what we will do. If something is up to us, we can decide what to do, rather than predict what we will do. But the reasons in light of which a decision is rational are not the same as the reasons in light of which a prediction is rational. That is why, provided it is important to us to do something we can rationally believe that we will do it, even if our belief goes against the evidence. (shrink)

The investigation into logical form and structure of natural sciences and mathematics covers a significant part of contemporary philosophy. In contrast to this, the metatheory of normative theories is a slowly developing research area in spite of its great predecessors, such as Aristotle, who discovered the sui generis character of practical logic, or Hume, who posed the “is-ought” problem. The intrinsic reason for this situation lies in the complex nature of practical logic. The metatheory of normative educational philosophy and theory (...) inherits all the difficulties inherent in the general metatheory but has also significantly contributed to its advancement. In particular, the discussion on its mixed normative-descriptive character and complex composition has remained an important part of research in educational philosophy and theory. The two points seem to be indisputable. First, the content of educational philosophy and theory is a complex one, connecting different disciplines. Second, these disciplines are integrated within the logical form of practical inference or means-end reasoning. On the other hand, the character of consequence relation in this field, although generally recognized as specific, represents an unresolved prob- lem, a solution of which requires a sophisticated logical theory and promises to influence the self- understanding of educational philosophy and theory. (shrink)

This paper is divided in four parts. In the first part we introduce the method of internal critique of philosophical theories by examination of their external consistency with scientific theories. In the second part two metaphysical and one epistemological postulate of Wittgenstein's Tractatus are made explicit and formally expressed. In the third part we examine whether Tractarian metaphysical and epistemological postulates (the independence of simple states of affairs, the unique mode of their composition, possibility of complete empirical knowledge) are externally (...) consistent with the theory of quantum mechanics. The result of the inquiry is negative: Tractarian postulates ought to be be revised. Relying on the result we approach the question of the empirical character of logic in the fourth part. The description of theoretical transformations of the notion of disjunction, in its ontological, epistemological, and logical sense, is a common element of in all parts of the text. The conjecture on the existence of different types of disjunctive connectives in the language of quantum mechanics concludes the paper. (shrink)

Za svjetlo možemo reći da je istinski razbuđivač mišljenja , kako u metafizici tako u prirodnoj filozofiji i znanosti. Želimo ukazati na posebnost Petrića kao onoga mislioca s kojim je dokončana epoha od antike nasljeđene metafizike svjetla i koji otvara put za novovjekovnu fiziku svjetla, naročito u djelu Panaugia, ali ne samo u njemu. Nakon Petrića uslijedila su brojna uzbudljiva znanstvena otkrića koja su rezultirala dubokim uvidima u narav svjetla, u geometriji, a posebice u fizikalnoj optici: svjetlo se širi konačnom (...) brzinom, složeno je, dio je elektromagnetskog spektra zračenja, djeluje na materiju , dovedeno je u svezu s masom i energijom. Ono nas začuđuje dualnošću svoje prirode čestice i vala. Istraživanjem zračenja tamnog tijela, suprotnosti vidljivog svjetla, otvorena je epoha kvantne fizike. Pitamo: Možemo li na osnovu mnoštva znanja o svjetlu do kojih su došli fizičari govoriti o bîti svjetla ? Fotonika je nova epoha u komunikacijskoj tehnologiji. Što tek treba očekivati od istraživanja fotosinteze?Light has been defined as a true instigator of thought both in metaphysicsand in philosophy of natureand science. This article focuses on the exceptional position of Frane Petrić as the philosopher with whom the epoch of metaphysics of light inherited fromantiquityended and the path for the new epoch of the physics of light started – especially inhiswork Panaugia,though not only in it. AfterPetrić, numerousexciting scientific discoveries occurred that resulted in profoundinsights into the nature of light – in geometry,and especiallyinphysical optics: light travels with finite speed, it is complex, it is part of electromagneticspecterof radiation, it has effect on matter , it has been relatedto mass and energy.Lightamazes us with the duality of its natureas both a particle and a wave. The researchon theradiationof dark objects and the contrast with visible light has opened the epoch of quantumphysics.The question this lectureposes is: Based on the body of knowledge about light accumulatedby the physicists, could we talk about the essence of light ? Photonics isanew epoch in communication technology.What then could we expect from the research on photosynthesis? (shrink)