论作为真理论的外在最小不动点理论

摘要

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.