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negation
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has an opposite truth value
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terms list
negation
has an opposite truth value
inverse
a conditional statement ngates both the hypothesis and the conclusion
contrapositive
a conditional that switches the hypothesis and the conclusion and negates both
equivalent statements
have the same truth value
indirect reasoning
all possibilities are considered and then all but one are proved false
indirect proof
a statement and its negation often are the only possibilties/ a proof involving indirect reasoning
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