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单词 BinaryOperation
释义

binary operation


A binary operationMathworldPlanetmath on a set X is a function from the Cartesian product X×X to X. A binary operation is sometimes called internal composition.

Rather than using function notation, it is usual to write binary operations with an operationMathworldPlanetmath symbol between elements, or even with no operation at all, it being understood that juxtaposed elements are to be combined using an operation that should be clear from the context.

Thus, additionPlanetmathPlanetmath of real numbers is the operation

(x,y)x+y,

and multiplication in a groupoid is the operation

(x,y)xy.
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