The law of excluded middle is one of the basic laws of thought, which underlies all demonstrations in the classical logic.
排中律是思维的基本规律之一，它构成古典逻辑中所有证明的基础。
Material and logical implication coincide in the classical logic, however they do not coincide in every logics.
实质蕴涵与逻辑蕴涵在经典命题逻辑中是一致的，但是二者并不是在任何逻辑中都一致。
Material and logical implication coincide in the classical logic, however they do not coincide in every logics.
实质蕴涵与逻辑蕴涵在经典命题逻辑中是一致的，但是二者并不是在任何逻辑中都一致。
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