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1 2 3 4 5 6 7 8 9 10 11 | )abbrev category COMRING CommutativeRing
++ Description:
++ The category of commutative rings with unity, rings where
++ \spadop{*} is commutative, and which have a multiplicative identity
++ element.
CommutativeRing() : Category == SIG where
SIG ==> Join(Ring,BiModule(%,%)) with
commutative("*") ++ multiplication is commutative.
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