If R denotes the set of real numbers, then R × R is just the set of points in the (Cartesian) plane or it can be regarded as the set of complex numbers, hence the name.
The concept can be extended to deal with the Cartesian product of n sets, S1,S2,…,Sn
This is the set of ordered n-tuples (s1,s2,…,sn)
with the property that each si is in Si. In the case where each Si is the same set S, it is customary to write Sn for S × S × … S (n terms)
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