inverse relation

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inverse relation

[¦in‚vərs ri′lā·shən]
(mathematics)
For a relation R, the inverse relation R -1 is the relation such that the ordered pair (x, y) belongs to R -1 if and only if (y, x belongs to R.
References in periodicals archive ?
Are Necessary and Sufficient Conditions Converse Relations ?
Claims that necessary and sufficient conditions are not converse relations are discussed, as well as the related claim that: "If A, then B" is not equivalent to "A, only ff B.