用归谬法证明一下题目是这样的：“IF I go to my offic

用归谬法证明一下
题目是这样的：
“IF I go to my office tomorrow,then I must get up before 7AM,and if i attend the dinner party at the club,i will return home late.IF i return home late and get up before 7AM,I will not sleep well.I want to sleep well.Therefoer,either i will not go to the office tomorrow or i will not attend the dinner party”(LET P=I will go to my office tomorrow,Q=I must get up before 7AM,R=I will attend the dinner party at the club,S=I return home late,W=I will sleep well)

该题有误,P,Q,R,S,均取真,W为假,上式蕴含不成立,左为真,右为假.
前提少了W

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