否命题，逆否命题的英文怎么说？

Jerry_zhou · 发表于 2011-4-25 21:57:02

如题，谢谢各位大侠

sdcar2010 · 发表于 2011-4-25 22:01:08

statement: if p then q
converse: if q then p
inverse: if not p then not q
contrapositive: if not q then not p

Jerry_zhou · 发表于 2011-4-25 23:14:53

非常感谢！！！

name	form	description
implication	if P then Q	first statement implies truth of second
inverse	if not P then not Q	negation of both statements
converse	if Q then P	reversal of both statements
contrapositive	if not Q then not P	reversal and negation of both statements
contradiction	if P then not Q	negation of second statement

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