**managed redundancy** Controlled redundancy, q.v.

**mandatory participation** *See* cardinality constraint.

**many-to-many correspondence** Strictly, a rule pairing two sets *s1* and *s2* (*s1* and *s2* not necessarily distinct) such that each element of *s1* corresponds to at least one element of *s2* and each element of *s2* corresponds to at least one element of *s1*; equivalently, that pairing itself. Often used loosely, however, to mean a pairing such that either (a) each element of *s1* corresponds to any number of elements of *s2* (possibly none at all) and each element of *s2* corresponds to at least one element of *s1*, or (b) each element of *s1* corresponds to at least one element of *s2* and each element of *s2* corresponds to any number of elements of *s1* (possibly ...

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