The classical Indian school called Nyāya (literally “logic” or “right reasoning”), is arguably the leading anti-skeptical tradition within all of Indian philosophy. Defending a realist metaphysics and an epistemology of “knowledge sources” (pramāṇa), its responses to skepticism are often appropriated by other schools of thought. This paper examines its responses to skeptical arguments from dreams, from “the three times,” from justificatory regress, and over the problem of induction.

In an episode in the Bhagavadgita Arjuna refuses to fight that would involve killing his teachers, elders, relatives and friends. Krishna argues that he should fight because it is the special duty of a soldier to fight in a just war, one should do one’s duty regardless of the consequences, one should act for the common good, one should build an unwavering character taking victory and defeat, pleasure and pain, friend and foe in the same way, etc. Some of these (...) reasons may be taken to promote deontology, others utilitarianism, yet others virtue ethics that are often viewed contemporarily as incompatible ethical theories. We argue that these three theories are not necessarily incompatible and may be linked to three sides of human nature: deontology to cognitivity, utilitarianism to dynamism and virtue ethics to affectivity. We also argue that Krishna may be taken to promote ethical pluralism just as he may be taken to promote religious pluralism by recommending the path of knowledge, the path of action and the path of devotion from an inclusive perspective. (shrink)

In the Buddhist view there can be no affirmation without negation and positive universals that in the Nyaya view are independent and eternal common characters shared by all members of a natural class should be replaced by difference from others that is a negative entity and a non-entity, e.g. what is meant by a cow is not that it is possessed of cow-ness but that it is not a non-cow. Udayana points out that cognition of a negative entity presupposes cognition (...) of what is negated, the negatum. Thus, cognition of cow if the same as not-not cow presupposes cognition of not-cow, but cognition of not-cow presupposes cognition of cow; hence the Buddhist view is open to the charge of mutual dependence. This difficulty does not arise in the Nyaya view. Even if there is no affirmation without negation, negation is not necessarily the content of affirmation. So far as common experience goes, cognition of positive entities does not always require cognition of negative entities, e.g. a cow may be recognized as a cow and possessed of cow-ness without reference to non-cows. (shrink)

This paper is historical and is devoted to an old controversy in the Indian philosophical tradition with the Vedantins (and others) holding that cognitive states are self-revealing and the Nyaya taking the opposite position. I have summarized the major Vedantin arguments for their viewpoint and offered a critique from the Nyaya perspective. This throws light on a major philosophical controversy in the Indian tradition, a controversy that has not been studied in-depth in the Western tradition. Notably the problem of induction, (...) a major problem in contemporary epistemology, has been studied in-depth in the Western tradition since its introduction by David Hume in the 18th century but the said problem has been studied deeply in Indian tradition for centuries earlier. I have argued in my Classical Indian Philosophy of Induction (2010) that the older Indian contribution on this problem is fully relevant for the very best that contemporary philosophers have offered on this. I hope that this paper will draw the attention of contemporary Western epistemologists who would get involved in this critically important epistemological debate and address a lacuna in the Western tradition. (shrink)

The problem of induction : East and West -- The later Nyaya solution -- The method of generalization : Vyaptigrahopayah -- Counterfactual reasoning : Tarkah -- Universal based extraordinary perception : Samanyalaksanapratyaksa -- Earlier views of adjuncts : Upadhivadah -- The accepted view of adjuncts : Upadhivadasiddhantah -- Classification of adjuncts : Upadhivibhagah -- Sriharsa's Khandanakhandakhadyam on pervasion -- Selected passages from Prabhacandra's Prameyakamalamartanda on critique of pervasion and inference -- Selections from Dharmakirti's Nyayabindu on non-perception as a probans.

Indian logic is mainly devoted to the study of nyaya the logical structure of which is analogous to that of a categorical syllogism. In a nyaya it is inferred that since the probans (similar to the middle term) is pervaded by or never exists without the probandum (similar to the major term) and since the probans belongs to the inferential subject (similar to the minor term), the probandum belongs to the inferential subject. Many modern scholars hold that in early Indian (...) logic a nyaya was an analogical argument from particular to particular. We disagree. Early Nyaya works say explicitly that what deviates is a pseudo-probans; this implies that a probans is non-deviant or pervaded by the probandum and thus that a universal premise stating the pervasion of the probans by the probandum is needed. Such a universal premise is also found in articulated arguments. Further, a counterargument based on mere analogy to a nyaya based on a universal connection is viewed as a pseudo-refutation. (shrink)

In the Nyaya view a causal condition is a non-superfluous invariable antecedent of the effect. Does this mean that causality for the Nyaya is a necessary connection as some scholars suggest? No. Invariable antecedence means that a causal condition is not the negatum of any absolute absence in the locus of the effect immediately before the latter’s origin (a causal condition is not absent where the effect arises immediately before origin). Non-superfluity means fulfilling requirements of economy three main kinds of (...) which are economy in constitution (non-inclusion of anything redundant), economy in relation (something related directly is preferable to something related indirectly) and economy in cognitive order (being knowable in fewer steps). None of the above jointly or severally involve necessity. (shrink)

Counterinference is one of five kinds of pseudo-prover (similar to fallacy in Western logic) recognized in the Nyaaya school. Typically in counterinference while one side seeks to prove the thesis that a probandum belongs to an inferential subject because an inferential mark pervaded by the probandum belongs to that subject, an opponent challenges that by arguing that the probandum does not belong to the inferential subject because another inferential mark pervaded by absence (negation) of the probandum belongs to that subject. (...) A common example is: sound is eternal, since it is audible and audibility is pervaded by eternality (i.e. all that is audible is eternal, like sound-ness, the common property of all sound particulars); but sound is non-eternal, since it is originated (by clapping hands, etc.) and all that is originated is non-eternal, like a pot, etc. Critics from other philosophical schools have objected that counterinference is not an additional kind of pseudo-prover. Since it is impossible for an inferential subject both to have and not to have a probandum, either at least one of the inferential marks does not belong to the inferential subject (the fallacy of being unestablished) or at least one of the inferential marks lacks pervasion (the fallacy of deviation) and, accordingly, counterinference should be subsumed under those fallacies. Nyaaya philosophers have responded by pointing out that the formal structure of counterinference is different from that of the other fallacies: in counterinference we have two different inferential marks but not in the other candidates. The epistemic result of counterinference is also different from that of the other fallacies mentioned, it is argued further. Moreover, it is contended (against a Nyaaya faction) that the epistemic result is not doubt as specifically understood in Nyaaya but desire to know the truth about the chosen inferential mark and the probandum. Accordingly, counterinference may be explained as that which provides the ground for inquiring what is the truth about the original inferential mark and its probandum due to presentation of an inferential assimilation (paraamarsha) that contradicts the original inferential assimilation. The discussion yields also a broader normative principle that contradiction or counterproof provides the epistemic ground for further inquiry even if there is proof. The selection is from the Tattva-cintaa-maNi, the canonical Navya-Nyaaya work of GaMgesha (14th century CE?). The selection is from a large work and presupposes some things explained elsewhere in the text. Further, though written with great precision the work paradoxically belongs to the old Indian philosophical oral tradition in which a beginner is expected to read it with the help of additional information supplied by an expert. Hence paying close attention to what is implied in the context and supplementing certain ideas is necessary for interpretation and understanding. (shrink)

As against the Buddhist view that everything is momentary Udayana argues that recognitive perception, such as that this is the same pot I saw before, provides evidence for permanence. Such recognitive perception is common experience and cannot be set aside without compelling evidence. The Buddhist objects that such experience is not reliable; even a burning flame is recognized to be the same, but it is clear from fuel consumption that it is not. Udayana agrees that in the case of a (...) burning flame it cannot be the same flame because then it would have to have opposed features (such as being fueled by more oil before and less oil now). But there is no compelling evidence for the claim that the pot or I would have to have opposed features if enduring. The Buddhist claim that anything enduring must have opposed features such as being both capable and incapable of being productive is groundless. Such features are not opposed and may be explained as being due to availability or non-availability of auxiliary causal conditions and so on. (shrink)

Definition is an important scientific and philosophical method. In all kinds of scientific and philosophical inquiries definition is provided to make clear the characteristics of the things under investigation. Definition in this sense, sometimes called real definition, should state the essence of the thing defined, according to Aristotle. In another (currently popular) sense, sometimes called nominal definition, definition explicates the meaning of a term already in use in an ordinary language or the scientific discourse or specifies the meaning of a (...) new term introduced in an ordinary language of the scientific discourse. Definition combines the purposes of both real and nominal definition and is promoted by the Nyaya philosophers of India. Another important method of science and philosophy is induction. In a narrow sense induction is a method of generalization to all cases from the observation of particular cases. In a broad sense induction is a method for reasoning from some observed fact to a different fact not involved in the former. We understand induction in the broad sense though more often we shall actually be concerned with induction in the narrow sense. How can our limited experience of nature provide the rational basis for making knowlege claims about unobserved phenomena? (shrink)

A Nyaya definition the major purpose of which is efficient use of words and avoiding ambiguities and errors, is the statement of a unique feature that belongs to each definiendum and nothing else so that there is none of the three faults of overcoverage, undercoverage and failure to belong to any definiendum. There should be no circularity that is of three kinds, self-dependence (where the definiendum appears in the definiens); mutual dependence (where the definiendum and the definiens are used in (...) the definition of each other) and defining in a circle. A definition should also be economical: there are mainly three kinds of economy; economy in constitution (that avoids including anything superfluous or unnecessary to distinguish the definiendum from everything else), economy in relation (the directly related is preferable to the indirectly related) and economy in cognition (something cognitively prior is preferable to something posterior). While more than one definition is possible that need not state the essence, the test of economy is in place to avoid redundancy and provide criteria of preference among defining features that are unique and non-circular. (shrink)

The paper has two main parts. The first part is devoted to the traditional Hindu viewpoint on the existence and permanence of the self as an immaterial substance. Various arguments offered by Hindu philosophers against the materialist view that the body is the self as well as arguments against the Buddhist view of the self as a stream of constantly changing states are discussed critically with reference to recent philosophical perspectives. The second part is devoted to the doctrine of karma (...) and rebirth. A number of traditional arguments for the doctrine are studied analytically and critically as well as relevance of the doctrine for addressing the problem of evil that for many is a serious issue facing the creationist position. Finally, the major arguments of Plato who also held that the self is eternal and goes through reincarnation are critiqued from a comparative standpoint. (shrink)

This article explains precisely in what sense the Nyaya philosophers promote a correspondence theory regarding the nature of truth. It also explains how truth may be inferred from successful effort and argues that successful effort can be produced only by true awareness. While successful effort is the major test of truth, other tests of truth in the Nyaya view should be recognized as and when appropriate. Thus, that if the pervaded belongs to something, the pervader too belongs to that thing (...) may be known to be true by the mind alone without reference to the inferential test of truth. Truth is in most cases extrinsic in the sense that truth of an awareness is determined with reference to another awareness. This does not lead to a vicious infinite regress; in some cases, as in the pervaded-pevader case or in the case there is cognition where there can be no cognition that there is cognition unless there is cognition, truth is intrinsic and may be determined without reference to another awareness. (shrink)

This paper deals with psycho-physical dualism as developed by Nyaya-Vaisesika philosophers. It is argued that internal states like pleasure, desire, etc. that are directly observable only by one’s own self and not by others and thus are private are not bodily states that are directly observable by one’s own self and others and thus are public. Common experiences such as I am happy, I want this, etc. testify, in the absence of compelling evidence to the contrary, that desire, etc. belong (...) to the self. The self is not only non-physical but also a permanent substance contrary to the Buddhist-Humean view that there are only fleeting internal states and no abiding self. Desire, etc. presuppose that the person who experienced something in the past remembers it now and desires it so that the agent of previous experience and later remembrance is the same continuant person. (shrink)

The Epicureans were committed to the priority of sensation and opposed the Platonic/Aristotelian view that definitions that display essences graspable only by reason should play a central role. To the Epicureans the so-called search for essences amounted to turning away from actual observation of things and indulging in speculation based on assumptions: instead one must conduct an inquiry about nature as the phenomena dictate. Epicurus held that the first or basic concepts of an inquiry need not be demonstrated for that (...) would open an infinite regress and might have held that the first concepts need not be defined for the definiens should be prior to the definiendum but nothing is prior to the basic concepts. Further, while explaining or defining each term is impossible (and perhaps involves infinite regress), explaining some is pointless. However, Epicureans were not opposed to providing descriptions so that there could be clear notions of words used, an investigation could proceed methodically, and all participants could agree on the subject matter. (shrink)

In the Stoic view a definition is a representation of a peculiar characteristic that is neither too wide nor too narrow and has necessary or reciprocal force and is a statement of analysis matchingly expressed. That is, a peculiar characteristic is convertible and coextensive with the definiendum. Many scholars hold that for the Stoics a defining characteristic is not only a feature that is co-extensive with the definiendum but is also essential. We do not find any conclusive evidence for this (...) claim. The Stoics nowhere say that a defining feature is not only peculiar but also essential. They also sometimes offer more than one definition of a thing and this goes against the Aristotelian position that since a thing has single essence, there can only be one definition in the ideal sense. Further, the Platonic/Aristotelian tradition views a definition as being mainly concerned with relations between universals. But for the Stoics universals are mental constructs, individuals alone are real, and definitions are ultimately about individuals. (shrink)