如罗素说,界说不是逻辑系统的部分。但是逻辑哲学却总要讲到界说。 所谓界说,本在亚里士多德之前,在苏格拉谛与柏拉图手里已既有了。亚里士多德承之,遂成立了影响两千年的界说学说。亚里士多德之后,始用“逻辑’(logike)为学名的斯多噶派也颇注意于界说的研究。完成该派学说系 As Russell said, defining is not part of the logic system. But the logic of philosophy is always about to speak. The so-called definition, before Aristotle, in the hands of Socrates and Plato both. Aristotle inherited, then set up two thousand years of influence theory. After Aristotle, the Stoics who used logistic as their scientific name also paid much attention to the demarcation research.