Question: For any cardinal numbers d and e we define their product de to be the cardinal number of the Cartesian product DX E, where

For any cardinal numbers d and e we define their product de to be the cardinal number of the Cartesian 

For any cardinal numbers d and e we define their product de to be the cardinal number of the Cartesian product DX E, where o(D)= d, o(E) = e.

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