Question: 9 . 0 . Let A and B be non - void subsets of R . The Cartesian product A B is open in R

9.0. Let A and B be non-void subsets of R. The Cartesian product AB is
open in R2 if and only if A and B are open in R.
9 . 0 . Let A and B be non - void subsets of R .

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