Cardinal Arithmetic
# Exponentiation
If $\kappa$ is an infinite cardinal, then $\kappa^{2} = \kappa$.
# Remarks
https://math.stackexchange.com/questions/2901201/a-cardinality-number-to-the-square-is-itself https://math.stackexchange.com/questions/180671/cardinality-of-cartesian-square/180691#180691
- This is equivalent to Axiom of Choice