将两个词项等同起来而形成一同一命题(identical proposition)并不必具普遍性和必然性，例如，我们说「独身汉是未结婚的男人，这只是一经验的同一命题，因为两词项是否相等依赖于我们的语言...
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N a necessary truth, esp a categorial identity, such as whatever is triangular has three sides 真命题; 必要的事实，尤指范畴的同一性 [logic]
The Republican Party in California has been a permanent minority party since 1994 when it backed Proposition 187, a law nearly identical to the Arizona Republican adopted last year.
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