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In terms of mathematical formula, does the negative proposition contradict the original proposition? Please ask the great god to answer in detail. Thank you.
Not contradictory, but not causal.
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Suppose the original name is: if p, then q;
Then the negative proposition is: if it is not P, it is not Q;
When the original proposition holds, the negative proposition may or may not hold, so the two are not contradictory.