contrapositive
noun
con·tra·pos·i·tive
| \ ˌkän-trə-ˈpä-zə-tiv
, -ˈpäz-tiv\
, -ˈpäz-tiv\
Definition of contrapositive
: a proposition or theorem formed by contradicting both the subject and predicate or both the hypothesis and conclusion of a given proposition or theorem and interchanging them
"if not-B then not-A " is the contrapositive of "if A then B "
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