Vādanyāya is one of the representative works of the Indian Buddhist logician Dharmakīrti in the seventh century AD.Its core connotation is an argumentation logic that deals with the rational rules of winning or losing in argumentation in the sense of generalized logic.This article selects a key issue in Vādanyāya,that is,Dharmakīrti's theory of"fault"in argumentation logic.Based on Dhar-makīrti's Chinese interpretation background of Hetuvidyā's original classics.The article first sorts out the prerequisites of argumen-tation logic,that is,the legitimacy of the three types of correct reasons in argumentation.Secondly,Dharmakīrti's notion of debate is different from that of the Naiyāyikas of vāda,jalpa,and vita(n)(d)ā.It is a kind of argument between two factions in an attempt to rationally persuade other arguers to change their wrong ideas,get their own opinions and refute others'opinions.Finally,based on this argumen-tation purpose,Dharmakīrti gave seven types of Nigrahasthāna,that is,non-justification of a constituent of proof,non-statement of a constituent of proof,statement of what is redundant as a part of proof,statement of a fallacious constituent of proof,statement of some-thing irrelevant,not pointing out a fault in disputant's argument,pointing out a non-fault as fault.
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