“De Morgan’s laws(logical version)”的概念、定义、翻译、参考文献-科学参考

单词	De Morgan’s laws(logical version)
释义	De Morgan’s laws(logical version) Mathematics These are the logical equivalent of the set-theoretic version. They capture the fact that for it not to be true that a family of statements all hold only one need be false. Given a family of statements P_i, where i ∈ I, then $\neg (\exists i \in I P_{i}) ⟺ \forall i \in I (\neg P_{i}), \neg (\forall i \in I P_{i}) ⟺ \exists i \in I (\neg P_{i}) .$
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