Cartesian product
From AoPSWiki
The Cartesian product of two sets 
and 
is the set of all ordered pairs 
such that 
is an element of and 
is an element of . More generally, the Cartesian product of an ordered family of sets 
is the set 
of ordered tuples 
such that 
is an element of 
, for any positive integer 
for which we have specified a set .
See Also
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