If a then b
If no a then no b, vis versa.
好像有問題,if a then b , 隻能推出 if no b then no a 吧
如果這兩個同時成立:if a then b, if no a then no b, 能不能推出 a = b?
If a then b
If no a then no b, vis versa.
好像有問題,if a then b , 隻能推出 if no b then no a 吧
如果這兩個同時成立:if a then b, if no a then no b, 能不能推出 a = b?
•
這個符號是不對,手機打得快
-kirn-
♀
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()
08/03/2023 postreply
19:01:34
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