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Questions on the calculus of variations, which deals with the optimization of functionals mostly defined on infinite dimensional spaces.

8 votes
Accepted

Minimizing the perimeter around an obstacle

For any sensible definition of perimeter, an adaptation of following argument proves the claim. Consider the nearest-point projection map $p_A:\mathbb R^n\to A$ (that is, for every $x\in\mathbb R^n$, …
Sergei Ivanov's user avatar
19 votes
Accepted

Minimal surface which divides a convex body into two regions of equal volume

The conjecture as you state it is false. The variational argument (that can be interpreted in terms of fluid pressure if you like) shows that the surface has constant mean curvature and is orthogonal …
Sergei Ivanov's user avatar