Mệnh đề đảo

Cho mệnh đề kéo theo PQ. Mệnh đề QP được gọi là mệnh đề đảo của mệnh đề PQ.
VD: Cho tam giác ABC. Mệnh đề đảo của mệnh đề “ Nếu tam giác ABC là tam giác đều thì nó là tam giác cân” là mệnh đề “Nếu tam giác ABC là tam giác cân thì nó là tam giác đều”.

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