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```binary operation∗
mclase†
2013-03-21 15:03:04
A binary operation 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 operation 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, addition of real numbers is the operation
(x, y) 7→ x + y,
and multiplication in a groupoid is the operation
(x, y) 7→ xy.
∗ hBinaryOperationi created: h2013-03-21i by: hmclasei version: h33574i Privacy setting:
h1i hDefinitioni h08A99i
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