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Simple logic of mathematics in senior one.
Both negative propositions and negative propositions deny conditions and results, but the latter should exchange conditions and results.

For example:

Give me 3000 chengguan, and I can conquer the world.

No proposition: I can't conquer the world without giving me 3000 chengguan.

Negative proposition: I can't conquer the world because I don't have 3000 chengguan.