On Dignāga's Hetuvidyā System From The Point Of 《nyāyadvāraāstra》

At the end of the 5th century A.D,there were kinds of philosophic thinkings were populared in India,but also many mal theories, even made a enormous threaten to the Buddhist'legitimacy status. In order to denounce heterodoxy's theories and consolidate Buddhist'legitimacy statu, DIGNāGA innovated the fomer Hetuvidyātheories in his representative work《NYāYA DVāRAāSTRA》,advanced some new theories such as the Nine-Hetu,Trirūpya,the three part inference model, and sort out the fomer Hetuvidyātheories.Made the Buddhist'Hetuvidyātheories to be a complete system. Logicians named Hetuvidyātheories before DIGNāGA as old Hetuvidyā, and after DIGNāGA as new Hetuvidyā. It is observed that《NYāYA DVāRAāSTRA》have a a milestone mean in indian logic'history.Academicians divide《NYāYA DVāRAāSTRA》into two parts: can stand and can not stand; can refute and can not refute. The"can stand"is the correct topic,reason and comparison.The"can not stand"is the wrong topic,wrong reason and wrong comparison.The"can refute"is a correct refute,in《NYāYA DVāRAāSTRA》it means that establish a suit of three part inference model which accord with the regulations of three characteristics of the middle terms. The"can not refute"is a mistake which is contrary to the regulations of three characteristics of the middle terms.This thesis is different with the fomer classification method made by most Academicians, divide this treatise into three parts:The first part begin by regulating conceptions of"same type"and"different type",make a detailed introduce about the Nine-Hetu and Trirūpya, make euler diagram and mathematical logic methods to analyse relations among the Nine-Hetu.The Nine-Hetu and Trirūpya constitute the DIGNāGA new Hetuvidyā'theory base.It is the basis for the three part inference model, and is also the standard to divide the fault theories.It has a cornerstone'function.The second part explains the three part inference model which is based on summing up the old Hetuvidyā'advantages and disadvantages. Emphasizes the action of the figure part's change from inductive inference to the deductive inference.And put forward some individual opinions for academicians'disputes about the nature of the three part inference model.The third part sums up all kinds of mistakes which are contrary to Trirūpya.It consists of 7 kinds of wrong topic'mistake,14 kinds of wrong reason'mistake and 10 kinds of wrong comparison'mistake. This thesis continues to use DIGNāGA's classification about"can not stand",and use vivid documentation to explain all kinds of mistakes.This classification method take the several theories in《NYāYA DVāRAāSTRA》as arestrict relation between the theoretical basis and the superstructure.It is meaningful and valuable for recognizing DIGNāGA's Hetuvidyāsystem.