Management Entrance Examination—Logic—Formal Logic—Summary—Knowledge Point Breakthrough—Formal Logic—Hypothesis & Corollary—A→B Contradiction A∧┐B

reading notes

1. The contradiction of P→Q is P∧┐Q, that is, the "and" proposition, that is, Р is affirmative and Q is negative. This is a must-take point for the annual exam and must be mastered.

2. Examine the difference between P→┐Q and P∧┐Q. This is an error-prone point, and candidates must pay attention. P→Q and P→┐Q are not contradictory, they belong to the relationship of at least one true [at least one false is the upper objection, at least one true is the lower objection, the true less is the upper (the needle pile is less)]; and P→ Q and P∧┐Q are contradictory relations, one is true and the other is false.

Angle - error prone point

Q :
$A$