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1 2 3 4 5 6 7 8 9 | )abbrev category ATCS CommutativeStarAttribute
++ Description:
++ The class of all commutative semigroups in multiplicative notation.
++ In other words domain \spad{D} with \spad{"*": (D,D) -> D} which is
++ commutative. Typially applied to rings.
CommutativeStarAttribute() : Category == SIG where
SIG ==> with nil
|