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Any finite metric space can be isometrically embedded in $(\mathbb R^n,||\cdot||_\infty)$ for some $n$?
Can a diffeomorphism between submanifolds be extended to a self-diffeomorphism of total manifold?
Oppenheim's Inequality for triangles, American Mathematical Monthly problems
Given a non-discrete topology on a finite set $X$, can you define a metric?
Deriving the Surface Area of a Spherical Triangle
Show that the following set is Lebesgue measurable
Can there exist a function that has a weak derivative, but is not differentiable almost everywhere?