The Nyāya school of classical Indian epistemology defended (by today’s standards) a radical version of epistemic externalism. They also gave arguments from their epistemological positions to an early version of disjunctivism about perceptual experience. In this paper I assess the value of such an argument, concluding that a modified version of the Nyāya argument may be defensible.

In his celebrated treatise of Navya-nyāya, the Tattvacintāmaṇi, Gaṅgeśa offers a detailed formulation of the inference of God’s existence. Gaṅgeśa’s inference generated significant commentarial literature among Naiyāyikas in Mithilā, Navadvīpa and Vārāṇasī, but also attracted the attention of South Indian scholars, notably Vyāsatīrtha, who comments on it extensively in the Tarkatāṇḍava. In the wake of Vyāsatīrtha’s pioneering critique, the 16th-century Sanskrit polymath Appaya Dīkṣita developed a revised version of Gaṅgeśa’s inference in his magnum opus of Śivādvaita Vedānta, the Śivārkamaṇidīpikā. This (...) article highlights that Appaya was thoroughly acquainted with the technical idiom of Navya-nyāya and sufficiently conversant with its literature to address authoritatively one of its key problems. Appaya’s contribution sheds new light on how the Navya-nyāya tradition continued to flourish in South India during the late medieval period. (shrink)

Often translated simply as "logic," the Sanskrit word _nyāya_ means "rule of reasoning" or "method of reasoning." Texts from the school of classical Indian philosophy that bears this name are concerned with cognition, reasoning, and the norms that govern rational debate. This translation of selections from the early school of Nyāya focuses on its foundational text, the _Nyāya-sūtra_, with excerpts from the early commentaries. It will be welcomed by specialists and non-specialists alike seeking an accessible text that both represents some (...) of the best of Indian philosophical thought and can be integrated into courses on Indian philosophy, religion, and intellectual culture. (shrink)

This is an overview of the Nyaya ("Logic") school of classical Indian philosophy, focusing on the earlier period (up to roughly 1000 CE).

The Nyãya philosophy is primarily concerned with the conditions of valid thought and the means of acquiring true knowledge of objects. Its ultimate end, like that of the other systems of Indian philosophy, is liberation-a state of pure existence- which is free from both pleasure and pain. For the attainment of this liberation, a true knowledge of objects is the surest means. Hence the theory of knowledge is the very foundation of the Nyãya system. The Nyãya Theory of Knowledge is (...) the first systematic, critical and comparative treatment of the Nyãya epistemology. It reveals how, as a thorough-going realistic view of the universe, the Nyãya philosophy supplies an important Eastern parallel to the triumphant modern Realism of the West, and contains anticipations of as well as possible alternatives to many contemporary realistic theories. This book is important as much for the correct understanding of ancient Indian philosophy, as for the evaluation of modern Western philosophy. (shrink)

In contemporary Cognitive Science and Philosophy of Mind, "attention" is a burgeoning field, with ever-increasing amounts of empirical research and philosophical analysis being directed toward it.1 In this essay I make a first attempt to contrast how Nyāya-Vaiśeṣikas2 and Buddhists would address some aspects of attention that are discussed in that literature. The sources of what I attribute to "Nyāya-Vaiśeṣikas" are the sections dealing with the manas in the Nyāyabhāṣya, Nyāyamañjarī, and Praśastapādabhāṣya. The words "Buddhist" and "Buddhism" in this essay (...) refer specifically to the Sautrāntika Buddhism of Vasubandhu's Abhidharmako-śabhāṣya.3 A comparison... (shrink)

Much of classical Hindu thought has centered on the question of self: what is it, how does it relate to various features of the world, and how may we benefit by realizing its depths? Attempting to gain a conceptual foothold on selfhood, Hindu thinkers commonly suggest that its distinctive feature is consciousness (caitanya). Well-worn metaphors compare the self to light as its awareness illumines the world of knowable objects. Consciousness becomes a touchstone to recognize the presence of a self. A (...) rock is insentient, void of consciousness, and purely an object. Selves, however, are loci of awareness and thus subjects. Some schools, most notably classical Sāṁkhya and Advaita Vedānta, take this approach to its furthest conclusion: consciousness is not only unique to the self, but is the fundamental feature of selfhood. Other putative features of the self—feelings, memories, moral responsibility, and importantly, agency (kartṛtva)—are taken to be the impositions of insentient matter (prakṛti) or symptoms of primordial illusion (avidyā). Against this position, Nyāya defends a more robust notion of selfhood, placing qualities like desire, aversion, volition, and moral responsibility alongside cognition as the self’s distinctive qualities. These various aspects of selfhood come together neatly when we consider agency. An agent performs intentional actions under her volition, which is triggered by her own cognitive and affective states. Her volitional acts further generate moral consequences which she must bear, and which are, in the Indian context, embodied in the form of karmic merit and demerit. For Nyāya, agency is, therefore, a special expression of the self’s different capacities and potentialities, which coherently binds them together. Nyāya’s view is an important contribution to Indian theories of self as it is a counterpoint to what we may call exclusively cognitive accounts of selfhood in other influential Hindu schools, as noted above. The first half of this paper will consider Nyāya’s conception of agency in relation to selfhood. The second half will discuss Nyāya’s arguments with other Hindu schools—specifically Sāṁkhya—in support of the thesis that the self must be an agent as well as a knower. (shrink)

This paper elaborates upon various responses to the Problem of the One over the Many, in the service of two central goals. The first is to situate Huayan's mereology within the context of Buddhism's historical development, showing its continuity with a broader tradition of philosophizing about part-whole relations. The second goal is to highlight the way in which Huayan's mereology combines the virtues of the Nyāya-Vaisheshika and Indian Buddhist solutions to the Problem of the One over the Many while avoiding (...) their vices. (shrink)

This paper focuses on the relevance of Indian epistemology and the philosophy of language to contemporary Western philosophy. Hence it discusses (1) how perceptual, inferential and verbal cognitions are related to the same object, (2) how to draw the distinction in meaning between transformationally equivalent sentences, such as ‘Brutus killed Caesar’ and ‘Caesar was killed by Brutus’, and (3) why the predicate-expression is to be considered as unsaturated but the subjectexpression as saturated. In order to answer these questions the Nyāya (...) philosophers have discussed the distinction between several pairs of terms, such as ‘subject–predicate’, ‘qualificand–qualifier’ and ‘the first term–the second term’. This paper also deals with the Nyāya conception of inference for others, and the interpretations of the premise called ‘upanaya’ (‘application’) or the cognition called ‘parāmarśa’ (‘operation’). (shrink)

One of the aims of this paper is to discuss the different senses of the term 'existence' as used by the nyaya philosophers. this discussion leads us to a discussion on absence or negation and its role in logic. a discussion on empty terms has also been introduced in this context. according to the nyaya, existence, knowability and nameability are considered as universal properties. the distinction between these universal properties has been discussed in this context. i have also (...) discussed the question whether the nyaya has used redundant terms in designating the same imposed property by using three different terms. a distinction between different senses of the term 'property' has also been discussed in this context. (shrink)

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.

The purpose of this paper is to demonstrate how the navya-Nyaya school of indian philosophy determines the truth or falsity of a sentence which contains an empty term, And to point out some similarities and differences between its method of analysis and truth-Value determinations of such sentences and that of bertrand russell.

Although a number of authors have used diagrams extensively in their studies of Navya-Nyāya, they have done so to explain and illustrate concepts, not with the goal of reasoning with the diagrams themselves. Adherents of diagrammatic reasoning have made claims for its potential by pointing to key structural correspondences between diagrams and logical concepts, arguably lacking in sentential representations, and describing these relations using concepts such as “well matchedness” and “iconicity”. A canonical example of this iconicity is the use of (...) Euler diagrams to depict categorical syllogisms. Since the meaning of expressions in Indian logic differs in so many important ways from logic in the Western tradition, the use or adaptation of diagrams developed in the latter would seem to preclude iconicity. Thus, the development of diagrams which reflect the nature of inference in Navya-Nyāya, which centres on the anumāna inference schema, is motivated. In this paper we extend Ganeri’s method of depicting the Vaiśeṣika ontology with graphs to include syntax intended to expose the nature of anumāna. The diagrams are given a formal basis: i.e. abstract syntax, inference rules defined abstractly and a graph-theoretic semantics. These are the first formalised logical diagrams that aim to reflect the nature of the anumāna inference. This paper lays the way for further work in extending the formalism to cover more of Navya-Nyāya, and in exploring a dialogue between properties of the formalism and of Navya-Nyāya. (shrink)

Scholarly disquisitions on Nyāya(-Vaiśeṣika) philosophy in the English language generally agree in calling it “metaphysical realism” or simply “realism.” Metaphysical realism or realism as understood in the West is the doctrine that (1) substances (particulars)/things and events exist independently of the knowing/thinking mind, and that (2) they exemplify properties/qualities and enter into relations—in short, universals—independently of the concepts by which we know them and, Nyāya would add, even of the language with which we describe them. This mind-independent world is supposed (...) to be something correspondence with which renders our particular beliefs/cognitions determinately true or false. Thus, realism, in all .. (shrink)

Misperception is part of the human condition. Consider a classic case of coming to confirm that one has had a misperception. On a stroll through the woods you see, in the distance, what seems to be a person. As you draw near, what looked like a person now appears to be a wooden post with a hat on it. On arrival you touch the post to confirm that it is not a person. From a pre-theoretical perspective, what has happened? On (...) your approach you judged that there was a person, based on what you saw. When near, you judged that it was a post and not a person, and then by touch you confirmed that what you initially saw was a misperception.In examining cases of misperception it is important to ask: what role does concept .. (shrink)

This work is a translation of selected sutras of the Nyāya-sūtra, together with relevant extracts from three commentaries: Nyāya-sūtra-bhāṣya of Vātsyāyana; Nyāya-vārttika of Uddyotakara; and Nyāya-vārttika-tātparya-ṭīkā of Vācaspatimiśra. The translators' introduction gives a general overview of the Nyāya school, its overall aims, and its place within classical Indian philosophy. Each of the nine chapters covers a particular topic in the Nyāya scheme: knowledge sources, philosophical method, the Nyāya defense of metaphysical realism, the self, substance and causation, God, theory of meaning, (...) value theory, and debate. For a given topic there will be sūtras... (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)

In this article, I explore the encounter of the Mādhva philosopher Vyāsatīrtha with the works of the Navya-Naiyāyika Gaṅgeśa Upādhyāya. The article is based on original translations of passages from Vyāsatīrtha’s Nyāyāmr̥ta and Tarkatāṇḍava. Philosophically, the article focuses on the issue of empty-terms/nonexistent entities, particularly in the context of the theory of inference. I begin by outlining the origin of the Mādhva and Nyāya positions about these issues in their respective analyses of perceptual illusion. I then contrast the role of (...) Gaṅgeśa’s thought in the Nyāyāmr̥ta and Tarkatāṇḍava and show how Vyāsatīrtha responds to Gaṅgeśa’s ideas in different ways in those texts. I conclude with a discussion of how Vyāsatīrtha defends the Mādhva theory of “substrate-free” qualities against Gaṅgeśa in order to show that we can think and make valid inferences about nonexistent things. (shrink)