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The Pramāṇavārttika (Brahmi: 𑀧𑁆𑀭𑀫𑀸𑀡𑀯𑀸𑀭𑁆𑀢𑁆𑀢𑀺𑀓, Commentary on Valid Cognition; Tib. tshad ma rnam 'grel) is an influential Buddhist text on pramana (valid instruments of knowledge, epistemic criteria), a form of Indian epistemology. The Pramāṇavārttika is the magnum opus of the Indian Buddhist Dharmakirti (floruit 6-7th centuries).[1][2]