http://en.wikipedia.org/wiki/De_Morgan's_laws
"The negation of a conjunction is the disjunction of the negations." and
"The negation of a disjunction is the conjunction of the negations."
本文详细解读了 De Morgan 的定律,阐述了否定合取的析取否定和否定析取的合取否定原理。
http://en.wikipedia.org/wiki/De_Morgan's_laws
"The negation of a conjunction is the disjunction of the negations." and
"The negation of a disjunction is the conjunction of the negations."

被折叠的 条评论
为什么被折叠?