Let $R=\{(1,1),(2,2),(3,2),(4,1)\}$. Then how can I calculate $R\times R$?
2026-03-25 17:18:38.1774459118
Cartesian product of 2 dimensional
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Recall that the cartesian product is the set of all ordered pair therefore
$$R\times R=\{((1,1),(2,2)),((1,1),(3,2)),\ldots\}$$
with $|R\times R|=16$.