Ordered pair
An ordered pair is a pair of two objects, usually denoted , in which we consider the order of the two objects to be important. Thus, the ordered pair
is different from the ordered pair
. This should be contrasted with the notion of set (or multiset), in which we have
. In general, we say two ordered pairs,
and
are the same if and only if
and
.
The notion of an ordered pair can be naturally extended to that of an ordered tuple.
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