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Śrī Harṣa (1125–80 CE). A Hindu philosopher of the Vedānta tradition and arguably the greatest Indian logician. His main work is the Khaṇḍanakhaṇḍakhādya, in which he rejects the pramāṇa (means of knowing) system as a way of gaining knowledge. To refute his opponents—he employed the vitaṇda method of argument which refutes a thesis (pratijñā) by reductio ad absurdum, but offers no positive counter-thesis. This parallels the prasaṅga method of the Buddhist Nagārjuna.