Buddhist logico-epistemology is a term used in Western scholarship to describe Buddhist systems of (doctrine of proof) and hetu-vidya (science of causes). is an epistemological study of the nature of knowledge; Hetu-vidya is a system of logic. These models developed in India during the 5th through 7th centuries.
The early Buddhist texts show that the historical Buddha was familiar with certain rules of reasoning used for debating purposes and made use of these against his opponents. He also seems to have held certain ideas about epistemology and reasoning, though he did not put forth a logico-epistemological system. The structure of debating rules and processes can be seen in the early Theravada text the Kathāvatthu.
The first Buddhist thinker to discuss logical and epistemic issues systematically was Vasubandhu in his Vāda-vidhi ("A Method for Argumentation"), who was influenced by the Hindu work on reasoning, the Nyāya-sūtra.
A mature system of Buddhist logic and epistemology was founded by the Buddhist scholar Dignāga (480–540 CE) in his magnum opus, the Pramāṇa-samuccaya. Dharmakirti further developed this system with several innovations. Dharmakirti's Pramanavarttika ("Commentary on Valid Cognition") became the main source of epistemology and reasoning in Tibetan Buddhism.
Scholars such as H.N. Randle and Fyodor Shcherbatskoy (1930s) initially employed terms such as “Indian Logic” and “Buddhist Logic” to refer to the Indian tradition of inference (anumāna), epistemology (pramana), and "science of causes" (hetu-vidyā). This tradition developed in the orthodox Hindu tradition known as Nyaya as well as in Buddhist philosophy. Logic in classical India, writes Bimal Krishna Matilal, is "the systematic study of informal inference-patterns, the rules of debate, the identification of sound inference vis-à-vis sophistical argument, and similar topics". As Matilal notes, this tradition developed out systematic debate theory (vadavidyā):
Logic as the study of the form of correct arguments and inference patterns, developed in India from the methodology of philosophical debate.
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The Nyāya Sūtras is an ancient Indian Sanskrit text composed by , and the foundational text of the Nyaya school of Hindu philosophy. The date when the text was composed, and the biography of its author is unknown, but variously estimated between 6th-century BCE and 2nd-century CE. The text may have been composed by more than one author, over a period of time. The text consists of five books, with two chapters in each book, with a cumulative total of 528 aphoristic sutras, about rules of reason, logic, epistemology and metaphysics.
The development of Indian logic dates back to the anviksiki of Medhatithi Gautama (c. 6th century BCE); the Sanskrit grammar rules of Pāṇini (c. 5th century BCE); the Vaisheshika school's analysis of atomism (c. 6th century BCE to 2nd century BCE); the analysis of inference by Gotama (c. 6th century BC to 2nd century CE), founder of the Nyaya school of Hindu philosophy; and the tetralemma of Nagarjuna (c. 2nd century CE). Indian logic stands as one of the three original traditions of logic, alongside the Greek and the Chinese logic.
(Sanskrit: शान्तरक्षित; , 725–788), whose name translates into English as "protected by the One who is at peace" was an important and influential Indian Buddhist philosopher, particularly for the Tibetan Buddhist tradition. Śāntarakṣita was a philosopher of the Madhyamaka school who studied at Nalanda monastery under Jñānagarbha, and became the founder of Samye, the first Buddhist monastery in Tibet. Śāntarakṣita defended a synthetic philosophy which combined Madhyamaka, Yogācāra and the logico-epistemology of Dharmakirti into a novel Madhyamaka philosophical system.