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並前往http://www.cs.cornell.edu/courses/cs2800/2017sp/lectures/lec38-prop.html

Intro to propositional logic (CS 2800, Spring 2017)

Students often confuse implication (φ→ψ) and entailment φ⊨ψ. They are two different kinds of symbols; one is a symbol in the object language and the other is ...

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