Noun
contrapositive (plural contrapositives)
(logic) The inverse of the converse of a given proposition.
According to this argument, this removes the alleged equivalence that is necessary to conclude that yellow cows can inform us about ravens: :In proper grammatical usage, a contrapositive argument ought not to be stated entirely in the indicative. Source: Internet
Finally, since differentiability implies continuity, the contrapositive states discontinuity implies non-differentiability. Source: Internet
Thus one could have a test of without having a test of its contrapositive. Source: Internet