The objective of this article is to develop a faith development perspective on corporate sustainability. A firm’s management of sustainability is arguably determined by the way decision-makers relate to the other and the natural environment, and this relationship is fundamentally shaped by faith. This study advances theoretical understanding of the approach managers take on sustainability issues by explaining how four distinct phases of faith development—improvidence, obedience, irreverence and providence—determine a manager’s disposition towards sustainability. Combining insights from intentional and relational faith (...) development theories, the analysis reveals that a manager’s faith disposition can be measured according to four interrelated process criteria: (1) connectivity as a measure of a manager’s actual engagement and activities aimed at relating to sustainability; (2) inclusivity as a measure of who and what is included or excluded in a manager’s moral consideration; (3) emotional affinity as a measure of a manager’s sensitivity and affection towards the well-being of others and ecological welfare; and (4) reciprocity as a measure of the degree to which a manager is rewarded for responding to the needs and concerns of ‘Others’, mainly in the form of a positive emotional (and relational) stimulus. The conceptual model consolidates earlier scholarly works on the psychological drivers of sustainability management by illuminating our search for a process of faith development that connects with an increasingly complex understanding of the role of business in society. (shrink)

The aim of this chapter is to develop a semantics for Calculus CL. CL is a diagrammatic calculus based on a logic machine presented by Johann Christian Lange in 1714, which combines features of Euler-, Venn-type, tree diagrams, squares of oppositions etc. In this chapter, it is argued that a Boolean account of formal ontology in CL helps to deal with logical oppositions and inferences of extended syllogistics. The result is a combination of Lange’s diagrams with an algebraic semantics of (...) terms: Bit-CL, in which any ordered objects are identified by characteristic bitstrings. Then, a number of objections to Bit-CL are answered to, and the process of inference is explained in this new logical framework. (shrink)

Powerviolence is a subgenre of hardcore music characterized by fast-paced rhythms, chaotic sound, and austere esthetics. Despite its seminal function for extreme music, there has been a notable lack of scholarly exploration into the genre. In this paper I draw on Comparative Philosophy to fill this gap. I argue that the powerviolence music and lyrics are fueled by anger. In Plato, anger serves as a tool for the irascible soul to support rational thinking and oppose injustice. Accordingly, I call for (...) a Platonic interpretation of powerviolence as an incentive for moral reformation in a world rife with violence and immorality. (shrink)

A general theory of logical oppositions is proposed by abstracting these from the Aristotelian background of quantified sentences. Opposition is a relation that goes beyond incompatibility (not being true together), and a question-answer semantics is devised to investigate the features of oppositions and opposites within a functional calculus. Finally, several theoretical problems about its applicability are considered.

A partir de la définition fonctionnelle du « néo-kantisme », dégagée par Cassirer dans un article de 1928, est ici tentée une évaluation des divers rapports que La Philosophie des formes symboliques entretient avec ce concept et quelquesuns de ses représentants historiques. Based on an examination of the functionnal definition of « neokantianism », explicated by Cassirer in a paper of 1928, this article focuses on his Philosophy of Symbolic Forms, addressing its relationship to this definition and to several historical (...) proponents of neokantianism. (shrink)

On analyse ici la structure et la dynamique d’un champ économique : le champ des opérations de LBO en France dans les années 2000. À partir de données relationnelles et de documents couvrant la période 2000-2010, nous tentons d’en expliquer l’explosion et l’implosion en identifiant trois mécanismes opérant à des échelles de temps distinctes et superposées : l’hégémonie financière, la coopération entre concurrents et la réaction aux crises. L’article illustre une manière d’utiliser l’analyse de réseaux sociaux afin de formaliser un (...) champ organisationnel et d’articuler structure et processus dans des ordres sociaux de niveau intermédiaire. (shrink)

Comment définir la mystique chrétienne au regard de la psychanalyse? Dans L'avenir d'une illusion, Freud inscrit la genèse de toute croyance religieuse dans l'angoisse et le vécu de la petite enfance. Illusoire, la religion tient sa force de la force des désirs qu'elle réalise. Les états et phénomènes mystiques, insolites, relèvent ainsi d'une angoisse portée à son paroxysme. Ce livre étudie deux profils mystiques présentés comme « cas cliniques », et qui semblent corroborer parfaitement le diagnostic du fondateur de la (...) psychanalyse. La vie mystique pourrait ainsi être ramenée à l'histoire de vie du sujet, dans le nouage de la relation triangulaire père-mère-enfant. La clinique dégage notamment, dans l'approche de la relation mère-enfant, le rôle déterminant du narcissisme, qui fait apparaître dans la mentalité chrétienne une polarité maternelle, fusionnelle, convoquée comme explication du désir d'union mystique sur le plan étiologique. L'approche clinique traditionnelle, pour pertinente qu'elle soit, accuse l'hétérogénéité manifeste avec cet objet déconcertant que constitue la vie mystique. Le mystique semble essentiellement démis du sens qui informe sa responsabilité dans l'expérience mystique, au profit d'une approche exclusivement libidinale de son discours et de ses affects. Viktor Frankl. qui fut élève et correspondant de Freud, souligne la limite de l'approche psychanalytique freudienne en proposant la notion d'un inconscient psychique qui soit avant tout et fondamentalement spirituel, de façon à rendre toute son intelligibilité à l'expérience mystique. (shrink)

Misunderstanding occurs between speakers when they disagree about the meaning of words in use. In the case of truth-values, Frege took these to be referents of sentences which consist of classes of accepted (i.e. “true”) or rejected (i.e. “false”) sentences. From this usual depiction of truth and falsity, a general algebraic framework is proposed to systematize the use of truth-values from a dialogical point of view of logic. A special attention will be paid to two radically opposed pseudo-speakers: Heraclites and (...) Nagarjuna, according to whom truth-values respectively refer to everything or nothing. Finally, dialectical (pseudo-Hegelian) negation will be rendered as a very special function: an ontological object-forming operator, similar to the arithmetic successor-forming operator Sn+1(x) on integers and consistent within our generalized theory of truth-values as variable referents. (shrink)

English summary: Jan Lukasiewicz (1878-1956) was one of the most important members of the Lwow-Warsaw school of logic. The thirteen translated articles in this volume demonstrate the protean form of Lukasiewiczs work, from his texts on Aristotle and the principle of non-contradiction and syllogistics to modal logic, intuitionism, and multivalent logics. The articles show in particular his preoccupations with logical precision and the problem of human liberty. French description: Avec Kazimierz Twardowski, Stanislaw Lesniewski et Alfred Tarski, le logicien et philosophe (...) polonais Jan Lukasiewicz (1878-1956) est l'un des membres les plus importants de l'Ecole de Lvov-Varsovie. Celebre pour ses ouvrages consacres a Aristote, notamment sur le principe de non-contradiction et sur la syllogistique, il a egalement publie des articles majeurs sur la logique propositionnelle, la logique modale, l'intuitionnisme et les logiques multivalentes, dont il fut l'un des fondateurs. Enfin, il a contribue a faire reconnaitre l'importance des travaux en logique de l'ecole megarico-stoicienne, trop longtemps eclipses par ceux d'Aristote sur la syllogistique. Mais Lukasiewicz ne fut pas seulement un logicien et un historien brillant, il s'engagea aussi dans les polemiques philosophiques de son temps. Il defendit ainsi la methode logique en philosophie. Proche sur ce point des membres du Cercle de Vienne, il ne rejetait pas pour autant les questions metaphysiques, commecelle du determinisme qui l'occupa toute sa vie. Les treize articles de ce recueil, fruit d'un travail collectif de traduction, ont pour ambition de montrer le caractere proteiforme de l'oeuvre de Lukasiewicz, preoccupe autant par la precision logique que par le probleme de la liberte humaine. (shrink)

Ce livre commence avec un problème de nomination de ce que l'on appelle économie et avec la disparition du terme chrématistique. Il pose l'hypothèse qu'il s'agit d'un problème métaphysique d'interprétation du réel et du monde. Le livre continue avec l'hypothèse étrange qui consiste à dire que la disparition du terme chrématistique est en lien avec la transformation substantielle et radicale du terme poièsis. Il pose alors la thèse qu'il y a une source fondamentale pour penser le problème de l'agir et (...) de l'opérativité et pour interpréter ce que l'on nomme une économie de l'œuvre. Enfin ce livre indique des manières de lire l'œuvre moderne et contemporaine en supposant qu'il y a eu, à cet endroit, un irrémédiable tournant : c'est ce que nous appelons critique de la poièsis. Ce livre pourra être lu de trois manières différentes et conjointes : comme un traité métaphysique de l'opérativité et de la disqualification des agir, comme un traité esthétique pour la lecture moderne du concept de poièsis (autrement dit de l'œuvre et de ses crises) et enfin comme un traité de philosophie politique en vue de faire face à ce qui tient de notre extrême et scandaleux contemporain. (shrink)

It has been recently argued that the well-known square of opposition is a gathering that can be reduced to a one-dimensional figure, an ordered line segment of positive and negative integers [3]. However, one-dimensionality leads to some difficulties once the structure of opposed terms extends to more complex sets. An alternative algebraic semantics is proposed to solve the problem of dimensionality in a systematic way, namely: partition (or bitstring) semantics. Finally, an alternative geometry yields a new and unique pattern of (...) oppositions that proceeds with colored diagrams and an increasing set of bitstrings. (shrink)

One of the most prominent myths in analytic philosophy is the so- called “Fregean Axiom”, according to which the reference of a sentence is a truth value. In contrast to this referential semantics, a use-based formal semantics will be constructed in which the logical value of a sentence is not its putative referent but the information it conveys. Let us call by “Question Answer Semantics” (thereafter: QAS) the corresponding formal semantics: a non-Fregean many-valued logic, where the meaning of any sentence (...) is an ordered n-tupled of yes-no answers to corresponding questions. A sample of philosophical problems will be approached in order to justify the relevance of QAS. These include: (1) illocutionary forces, and the logical analysis of speech-acts; (2) the variety of logical negations, and their characterization in terms of restricted ranges of logical values; (3) change in meaning, and the use of dynamic oppositions for belief sets. (shrink)

A general framework for translating various logical systems is presented, including a set of partial unary operators of affirmation and negation. Despite its usual reading, affirmation is not redundant in any domain of values and whenever it does not behave like a full mapping. After depicting the process of partial functions, a number of logics are translated through a variety of affirmations and a unique pair of negations. This relies upon two preconditions: a deconstruction of truth-values as ordered and structured (...) objects, unlike its mainstream presentation as a simple object; a redefinition of the Principle of Bivalence as a set of four independent properties, such that its definition does not equate with normality. (shrink)

Le philosophe Gerald A. Cohen est décédé le 5 août 2009. Sa contribution s’est d’abord articulée autour de la pensée de Marx. Elle émergea sur la scène intellectuelle en 1978 avec la parution de Karl Marx’s Theory of History : A Defence, qui impulsa la constitution du marxisme analytique. Par la suite, Cohen tendit à se détacher progressivement de la théorie de Marx. Il participa à la discussion sur le concept libertarien de propriété de soi en vue de l’associer à (...) une approche marxiste, avant d’intégrer pleinement le débat normatif autour des problématiques de justice sociale, autour de la Théorie de la justice de John Rawls. Fondée sur la philosophie kantienne, sa critique de la théorie de Rawls lui reproche de ne pas accorder suffisamment d’autonomie aux choix individuels. Le présent article discute la pertinence du voyage intellectuel de Jerry Cohen dans son rapport à l’œuvre de Marx. (shrink)

Entre les premiers developpements de la mecanique galileenne et la publication des Principia de Newton, s'est jouee une transformation radicale de la philosophie naturelle des modernes. Mathematiques, sciences de la nature et techniques de precision ont faconne d'une part une nouvelle maniere, active et operatoire, d'interroger la nature, et d'autre part une image du monde fondee sur l'idee d'une rationalite integrale des phenomenes. Interlocuteur infatigable de Mersenne, Galilee, Descartes, Leibniz ou Newton, Christiaan Huygens (1629-1695) a assure un lien necessaire pour (...) son epoque entre l'assimilation critique des Principes de la philosophie de Descartes, dont il retient l'exigence d'intelligibilite dans la conduite de la science, et la reception - critique elle aussi - des Principes mathematiques newtoniens. La methode de Huygens se structure dans les apports cartesien et galileen: choc des corps, oscillations du pendule, etude de la force et du mouvement en tant qu'expression de rapports geometriques, caracterisation de la nature de la lumiere sont autant de champs dans lesquels il est impossible de ne pas voir l'impregnation d'un questionnement philosophique permanent. C'est donc en philosophe tout autant qu'en physicien qu'il s'oppose aux definitions newtoniennes de la lumiere et de la pesanteur. (shrink)

Claude Tresmontant (1925-1997) était professeur de philosophie médiévale et d'histoire des sciences à la Sorbonne. Ce livre présente ses thèses en insistant sur l'articulation entre les sciences et la question de l'existence de Dieu. La rationalité de la théologie chrétienne est soutenue. Ses travaux aboutissent à démontrer l'existence de Dieu et soulèvent l'alternative suivante : admettre l'existence du Créateur ou la refuser tout en continuant d'être les héritiers du matérialisme qui fit florès jusqu'aux réductionnistes contemporains. La finalité de l'évolution n'étant (...) autre que l'union de la nature humaine créée à la nature divine incréée, union dont le Christ incarne le Premier-Né. Les sciences donneraient alors accès à la Création en cours d'évolution, tandis que la Bible contiendrait le secret de l'information essentielle sur son avenir. 'Emounah' en hébreu, 'certitude de la vérité', la foi reviendrait ainsi à un acte rationnel, et non à une croyance purement affective"--Page 4 of cover. (shrink)

Dans le sillage de Chris Marker ou de Grégory Chatonsky, de plus en plus d’artistes contemporains pratiquent la réappropriation, le détournement, l’usage critique de l’intelligence artificielle. Grand connaisseur des arts numériques, Fabien Zocco est l’un d’entre eux. Il est l’auteur, avec le réalisateur Gwendal Sartre, d’ Attack The Sun, film dont des dialogues ont été générés par une IA au cours même du tournage qui suit la dérive d’un youtuber californien paraissant sombrer dans une folie de tuerie. L’enjeu : (...) éprouver « de l’intérieur » des outils contemporains comme l’IA pour « escompter ensuite analyser et déconstruire leurs effets ». (shrink)

The present paper wants to develop a formal semantics about a special class of formulas: quantifying statements, which are a kind of predicative statements where both subject- and predicate terms are quantifier expressions like ‘everything’, ‘something’, and ‘nothing’. After showing how talking about nothingness makes sense despite philosophical objections, I contend that there are two sorts of meaning in phrases including ‘thing’, viz. as an individual (e.g. ‘some thing’) or as a property (e.g. ‘something’). Then I display two kinds of (...) logical forms for quantifying statements, depending on how these ‘thing’s are ordered into a whole predication. Finally, an algebraic semantics is proposed for the finite set of quantifying statements to order these into a (fragmentary) dodecagon of logical relations. The corresponding Sub-Model Semantics (hereafter: $$\mathbb {SMS}$$ ) aims to update the usual theory of opposition whilst leading to a research program for other kinds of statement like categorical and even modal propositions. (shrink)

A formal theory of oppositions and opposites is proposed on the basis of a non- Fregean semantics, where opposites are negation-forming operators that shed some new light on the connection between opposition and negation. The paper proceeds as follows. After recalling the historical background, oppositions and opposites are compared from a mathematical perspective: the first occurs as a relation, the second as a function. Then the main point of the paper appears with a calculus of oppositions, by means of a (...) non-Fregean semantics that redefines the logical values of various sorts of sentences. A num- ber of topics are then addressed in the light of this algebraic semantics, namely: how to construct value-functional operators for any logical opposition, beyond the classical case of contradiction; Blanché's "closure problem", i.e., how to find a complete structure connecting the sixteen binary sentences with one another. All of this is meant to devise an abstract theory of opposition: it encompasses the relation of consequence as subalternation, while relying upon the use of a primary "proto- negation" that turns any relatum into an opposite. This results in sentential negations that proceed as intensional operators, while negation is broadly viewed as a difference-forming operator without special constraints on it. (shrink)

Hugh MacColl is commonly seen as a pioneer of modal and many-valued logic, given his introduction of modalities that go beyond plain truth and falsehood. But a closer examination shows that such a legacy is debatable and should take into account the way in which these modalities proceeded. We argue that, while MacColl devised a modal logic in the broad sense of the word, he did not give rise to a many-valued logic in the strict sense. Rather, his logic is (...) similar to a “non-Fregean logic”: an algebraic logic that partitions the semantic classes of truth and falsehood into subclasses but does not extend the range of truth-values. (shrink)

Roman Suszko said that “Obviously, any multiplication of logical values is a mad idea and, in fact, Łukasiewicz did not actualize it.” The aim of the present paper is to qualify this ‘obvious’ statement through a number of logical and philosophical writings by Professor Jan Woleński, all focusing on the nature of truth-values and their multiple uses in philosophy. It results in a reconstruction of such an abstract object, doing justice to what Suszko held a ‘mad’ project within a generalized (...) logic of judgments. Four main issues raised by Woleński will be considered to test the insightfulness of such generalized truth-values, namely: the principle of bivalence, the logic of scepticism, the coherence theory of truth, and nothingness. (shrink)

My aim in this book is to propose a comparativist, Buddhist-Neoplatonic interpretation of the idea of “logos” in the Prologue to the Gospel according to John. To do so, I proceed in three steps. I begin with Nāgārjuna’s doctrine of emptiness. Nāgārjuna thinks that that all things are empty because they depend on causes and conditions in a way that makes it impossible for them to genuinely exist. Nevertheless, they are not completely non-existent, for they possess the appearance of something (...) that exists. This corresponds, in turn, to Vasubandhu’s response to Nāgārjuna. Emptiness is not ultimate because there is the appearance of empty things. The place where this appearance unfolds is the mind, which, in an absolute sense, exists, but which, in the sense of external, objectifiable reality does not exist. Vasubandhu thus thinks of the mind as an entity that does not conform to the categories of ordinary existence. This, then, corresponds to what Meister Eckhart says about God. God is a Mind ("intellectus"). But due to his fundamental ontological role, God transcends ordinary existence and cannot be compared to any specific being. God is the mind of which Vasubandhu states that it is non-dual, transcendent knowledge. To conclude, I use this triadic constellation of Buddhist and Neoplatonic concepts to read John’s Prologue. The Prologue describes the generation of a foundational concept, “logos,” by a primordial, divine Mind. Since this Mind is, in a Buddhist sense, “empty,” the concept that it generates can be said to be absolute. It has no beginning and no cause. Against this background of Buddhist and Neoplatonic ideas, John’s Prologue can thus be interpreted as a narrative describing the foundation of reality as an intellectual process. (shrink)

Ces études voudraient inviter le public francophone à la découverte de la philosophie de l'école de Marbourg et de son apport au site pratique de la philosophie. La réflexion morale, juridique et politique s'est trouvée fort enrichie par les écrits de Friedrich Albert Lange, Hermann Cohen et Paul Natorp. Ernst Cassirer a poursuivi la réflexion de ses maîtres en théorie de la connaissance, mais aussi dans le site pratique, ici dominé par un socialisme d'inspiration kantienne.

Ce texte est une proposition d’interprétation des liens, substantiels, conceptuels et théoriques, qui existent entre ce qu’il est possible de nommer économie et ce que nous nommons poésie. Notre hypothèse est qu’économie et poésie fonctionnent de la même manière du fait d’une contrainte ontologique forte imposée à la poésie. La modernité poétique essaie de s’en défaire et donc le poétique est un art récent.

This paper discusses the philosophical and logical motivations for rejectivism, primarily by considering a dialogical approach to logic, which is formalized in a Question–Answer Semantics. We develop a generalized account of rejectivism through close consideration of Mark Textor's arguments against rejectivism that the negative expression ‘No’ is never used as an act of rejection and is equivalent with a negative sentence. In doing so, we also shed light upon well-known issues regarding the supposed non-embeddability and non-iterability of force indicators.

A analysis of some concepts of logic is proposed, around the work of Edelcio de Souza. Two of his related issues will be emphasized, namely: opposition, and quasi-truth. After a review of opposition between logical systems [2], its extension to many-valuedness is considered following a special semantics including partial operators [13]. Following this semantic framework, the concepts of antilogic and counterlogic are translated into opposition-forming operators [15] and specified as special cases of contradictoriness and contrariety. Then quasi-truth [5] is introduced (...) and equally translated as a product of two partial operators. Finally, the reflections proposed around opposition and quasi-truth lead to a third new logical concept: quasi-opposition, borrowing the central feature of partiality and opening the way to a potential field of new investigations into philosophical logic. (shrink)

Ce bref article décrit une œuvre contemporaine conçue comme un « bricodage » conduisant une IA à bégayer des semblants de phrases en italien. Dislessia joue de la confusion entre la composante syntaxique du langage que semblent maîtriser les IA génératives et la dimension sémantique vectrice de sens qui leur sont inaccessibles.

Abstract : A measurement result is never absolutely accurate: it is affected by an unknown “measurement error” which characterizes the discrepancy between the obtained value and the “true value” of the quantity intended to be measured. As a consequence, to be acceptable a measurement result cannot take the form of a unique numerical value, but has to be accompanied by an indication of its “measurement uncertainty”, which enunciates a state of doubt. What, though, is the value of measurement uncertainty? What (...) is its numerical value: how does one calculate it? What is its epistemic value: how one should interpret a measurement result? Firstly, we describe the statistical models that scientists make use of in contemporary metrology to perform an uncertainty analysis, and we show that the issue of the interpretation of probabilities is vigorously debated. This debate brings out epistemological issues about the nature and function of physical measurements, metrologists insisting in particular on the subjective aspect of measurement. Secondly, we examine the philosophical elaboration of metrologists in their technical works, where they criticize the use of the notion of “true value” of a physical quantity. We then challenge this elaboration and defend such a notion. The third part turns to a specific use of measurement uncertainty in order to address our thematic from the perspective of precision physics, considering the activity of the adjustments of physical constants. In the course of this activity, physicists have developed a dynamic conception of the accuracy of their measurement results, oriented towards a future progress of knowledge, and underlining the epistemic virtues of a never-ending process of identification and correction of measurement errors. (shrink)

This article discusses the definitions of ‘‘measurement uncertainty” given in the three editions of the International Vocabulary of Metrology (VIM) and a fourth definition which was suggested for the next edition of this document. It is argued that none of the definitions is satisfying. First, a thorough definition of measurement uncertainty should supply an explanation about the meaning of the concept, which is missing from the VIM2&3. Secondly, when provided, the meanings are not accurate enough: the VIM1 version is flawed (...) and the possible future definition appeals to an overly restrictive notion of ‘‘belief”. Alternative options are then proposed, based on the conclusions that (i) measurement uncertainty is a statement – an inference – made by the experimenter about the measurand; (ii) it is only based on what is accessible to one’s knowledge, and therefore rests on the hypothesis that no unknown systematic error affects the measurement. (shrink)

An analogy is made between two rather different domains, namely: logic, and football. Starting from a comparative table between the two activities, an alternative explanation of logic is given in terms of players, ball, goal, and the like. Our main thesis is that, just as the task of logic is preserving truth from premises to the conclusion, footballers strive to keep the ball as far as possible until the opposite goal. Assuming this analogy may help think about logic in the (...) same way as in dialogical logic, but it should also present truth-values in an alternative sense of speech-acts occurring in a dialogue. The relativity of truth-values is focused by this way, thereby leading to an additional way of logical pluralism. (shrink)

Our aim is to propose a non-referential semantics for the principle of logical charity: neither logical universalism (one logic, one way of thinking), nor logical relativism (several logics, several ways of thinking) afford an adequate conceptual framework to interpret the meaning of any speech act. But neither of them is totally wrong, either. The point is to know to which extent each of these views is partly right, thus leading to a more consensual but paradoxical-sounding "relative principle of charity". After (...) recalling the theoretical background of logical charity, we suggest a four-valued logic of acceptance and rejection (hereafter: AR4); then we explain how such a non-referential semantics does justice both to the champions of logical charity and its opponents. While endorsing coherence as a precondition for rationality, we argue that such a criterion does not entail that classical logic is a necessary conceptual scheme to interpret the others' beliefs. A better application of charity should take account of the questions implicitly asked by a statement, and we bring these questions out in replacing Quine's truth-functions by Quine’s verdict functions while emphasizing upon their varying degrees of strength. (shrink)

The present contribution might be regarded as a kind of defense of the common sense in logic. It is demonstrated that if the classical negation is interpreted as the minimal negation with n = 2 truth values, then deviant logics can be conceived as extension of the classical bivalent frame. Such classical apprehension of negation is possible in non- classical logics as well, if truth value is internalized and bivalence is replaced by bipartition.

A logical theory of oppositions deals with the relation between propositions and their truth values. On the basis of a formal semantics that proceeds by means of questions-answers, three theses are claimed in the following: (1) the concept of opposition usually refers to incompatibility, but our logical analysis focusses upon a broader relation of difference; (2) more generally, opposition has to do with negativity; our semantics accounts for it through opposite-forming operators; (3) subalternation is a particular case of non-contradiction expressing (...) an “opposition of an opposition”; it is not a proper opposition, accordingly, but its very meaning depends upon the latter. There is not only one but rather a number of expressions for negativity and the paper presents a detailed analysis of these "floating" expressions in a twofold sense of the word: floating quantification is closely related to the logical operations of sentential negation and denial; to what extent natural languages do not clearly express the meaning of a negative thought will be exemplified. L'objectif du texte qui suit est double : non seulement proposer une analyse logique du concept d'opposition, susceptible d'apporter de la précision à cette notion tout aussi vague que courante ; mais aussi, proposer une explication des différentes façons dont la négation se manifeste dans les langues naturelles, en particulier dans notre modèle local de la langue française. Tandis que la communauté des linguistes propose couramment une distinction entre une négation logique et une négation linguistique, l'article qui suit a la prétention d'une explication unifiée de la négation, c'est-à-dire un cadre théorique commun dans lequel ces deux aspects de l'opérateur de négation apparaissent comme des cas particuliers aux significations distinctes. Il n'y aurait donc pas une négation logique, d'un côté, et une négation linguistique ou "métalinguistique", de l'autre. Une approche structurelle des expressions négatives devrait apporter un éclairage sur ce point, par le biais d'une analyse algébrique de la signification en termes de questions-réponses. Mais revenons pour commencer sur l'origine philosophique du concept d'opposition, avant d'en exposer les propriétés logiques par la suite et les expressions linguistiques pour conclure. (shrink)