论作为真理论的外在最小不动点理论

An Invesigation into the External Least Fixed Point of Truth

真谓词的内在最小不动点理论(KFS)因其弗完全性而饱受批评,外在最小不动点理论(KF)试图弥补KFS的不足。然而其刻画的真谓词不仅不满足实质恰当性的条件,还使真谓词丧失了表达同意与不同意的功能,另外KFS在一定程度上是自毁的。人们试图对KF进行辩护,遗憾的是,无论采取回避态度还是致力于解决这些困难,都无法让人接受KF是一个良好的真理论。

KFS, as a truth theory, is criticized widely for its paracompleteness. The external least fixed point theory（KF） attempts to cover the shortage of KFS. However, the truth predi- cate characterized by KF loses some function and doesn＇t satisfy the material condition for truth. Beside, KF is a self-undermining theory to some extent. Some defenses for KF are raised, inclu- ding the attempts to avoid difficulties and the attempts to solve the problem. Unfortunately, these defense doesn＇t make KF to be a more reasonable truth theory.