若假言判断断言前件真后件必真,前件假后件必假,则该判断为_____条件假言判断。
充分必要 一个充分必要条件假言判断为真,当且仅当其前件、后件同为真或同为假。即当前、后件真假相同时,充分必要条件假言判断为真。
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