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Negative proposition of mathematics in senior two.
Proposition: A statement that can be judged true or false is called a proposition.

The original proposition is: a-> b

The antithesis is: b-> a.

No proposition: not a- > not b

The negative proposition is: not b- > not a.

Reciprocal negative proposition: If the condition and conclusion of one of the two propositions are the negation of the conclusion and condition of the other proposition, the two propositions are called reciprocal negative propositions.