We can define the relation of meanings and especially the truth of logic-mathematic statements by just examining the kinds and sequences of symbols ( i.e., syntactic rules). This is the criteria of validity which analytical definition develops. 我们仅通过考察符号的类别和顺序(句法规则)就可以确定意义关系问题,尤其是能够确定逻辑-数学语句的真值,这就是分析性定义所确立的有效性标准。