连续一阶逻辑是经典一阶逻辑的一个类比。
Continuous first-order logic is an analog of classical first-order logic.
描述逻辑是一种知识表示的形式化语言,是一阶逻辑的可判定子集。
Description logic is a formal language for representing knowledge and it is a decidable subset of first-order logic.
实数集的上确界公理用到了实数集的子集,这是一种二阶逻辑的陈述。
The supremum axiom of the reals refers to subsets of the reals and is therefore a second-order logical statement.
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