- A square in $\mathbb{R}^M \times \mathbb{R}^N$ can be defined as the set of all points $(x, y)$ such that $x \in [a, b]$ and $y \in [c, d]$ for some $a, b, c, d \in \mathbb{R}$ with $M, N \geq 1$.
- A disk in $\mathbb{R}^M \times \mathbb{R}^N$ can be defined as
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