A
binary function is a
function where the domain is the
subset of the
Cartesian product of two
sets. For example, the function
plus :
N ×
N ->
N that maps an
ordered pair of
natural numbers to their sum. The application of
plus to an ordered pair (
x,
y), that is
plus((
x,
y)) is usually simply written as
plus(
x,
y).
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