经典命题逻辑是现代形式逻辑的基础。
The classical proposition logic is the basis of modern formal logic.
完美信息流推理不涉及模态概念，理想信息逻辑类似经典命题逻辑。
Because perfect IF inferences donot involve modal concepts, idealized IF logic is analogous to classical propositional logic.
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.
本文从语构理论入手，在经典二值命题逻辑系统中给出公式的语构真度的概念，从两个不同的角度给出语构真度的等价刻画。
From the syntactical point of view, the concept of the syntactic truth degree of formulas is proposed in two-valued propositional logic system.
本文从语构理论入手，在经典二值命题逻辑系统中给出公式的语构真度的概念，从两个不同的角度给出语构真度的等价刻画。
From the syntactical point of view, the concept of the syntactic truth degree of formulas is proposed in two-valued propositional logic system.
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