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The Navya-Nyāya or Neo-Logical darśana (view, system, or school) of Indian logic and Indian philosophy was founded in the 13th century CE by the philosopher Gangeśa Upādhyāya of Mithila and continued by Raghunatha Siromani. It was a development of the classical Nyāya darśana. Other influences on Navya-Nyāya were the work of earlier philosophers Vācaspati Miśra (900–980 CE) and Udayana (late 10th century). It remained active in India through to the 18th century.
Gangeśa's book Tattvacintāmaṇi ("Thought-Jewel of Reality") was written partly in response to Śrīharśa's Khandanakhandakhādya, a defence of Advaita Vedānta, which had offered a set of thorough criticisms of Nyāya theories of thought and language. In his book, Gangeśa both addressed some of those criticisms and – more important – critically examined the Nyāya darśana itself. He held that, while Śrīharśa had failed to successfully challenge the Nyāya realist ontology, his and Gangeśa's own criticisms brought out a need to improve and refine the logical and linguistic tools of Nyāya thought, to make them more rigorous and precise.
Tattvacintāmani dealt with all the important aspects of Indian philosophy, logic, set theory, and especially epistemology, which Gangeśa examined rigorously, developing and improving the Nyāya scheme, and offering examples. The results, especially his analysis of cognition, were taken up and used by other darśanas.
Navya-Nyāya developed a sophisticated language and conceptual scheme that allowed it to raise, analyse, and solve problems in logic and epistemology. It systematised all the Nyāya concepts into four main categories (sense-)perception (pratyakşa), inference (anumāna), comparison or similarity (upamāna), and testimony (sound or word; śabda). Prof John Vattanky has contributed significantly to the modern understanding of Navya-Nyāya.
Sources and further reading
- Bimal Krishna Matilal, The Navya-Nyaya Doctrine of Negation: The Semantics and Ontology of Negative Statements in Navya-Nyaya Philosophy (Harvard University Press, 1968) ISBN 0-674-60650-7
- J. N. Mohanty, Classical Indian Philosophy (Rowman & Littlefield, 2000) ISBN 0-8476-8933-6
- Sarvepalli Radhakrishnan, et al. [edd], History of Philosophy Eastern and Western: Volume One (George Allen & Unwin, 1952)
- Vattanky, John, Nyāyapañcānana B. Viśvanātha, Nyāyapañcānana B. Viśvanātha, and Dinakarabhaṭṭa. Nyāya Philosophy of Language: Analysis, Text, Translation and Interpretation of Upamāna and Śabda Sections of Kārikāvalī, Muktāvalī and Dinakarī. (Delhi: Sri Satguru Publications, 1995)
- Vattanky, John. A System of Indian Logic: The Nyana Theory of Inference. (London : Routledge, 2015)
- Vattanky, John. Development of Nyāya theism. (New Delhi: Intercultural Publications, 1993)
- Vattanky, John (1984). Gaṅgeśa's Philosophy of God: Analysis, Text, Transl. and Interpretation of Iśvaravāda Section of Gaṅgeśa's Tattvacintāmaṇi with a Study on the Development of Nyāya Theism. Madras: Adyar Libr. and Research Centre.
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