SECTION 2 BINARY OPERATIONS
          SECTION 2 BINARY OPERATIONS. Definition: A binary operation  on a set S is a function mapping S X S into S. For each (a, b)  S X S, we will denote the element ((a, b)) of S by a  b. Example: Our usual addition + is a binary operation on the set R (C, Z, R + , or Z + ).
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