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Questions about geometric properties of sets using measure theoretic techniques; rectifiability of sets and measures, currents, Plateau problem, isoperimetric inequality and related topics.

11 votes
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Concentration of measure for arbitrary convex bodies?

There are many results, and an active research industry, along these lines. In general the Euclidean ball is the best-behaved convex body in this respect, and just how similar an arbitrary convex bod …
Mark Meckes's user avatar
  • 11.4k
16 votes
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Stronger version of the isoperimetric inequality

A classical result along these lines is Bonnesen's inequality, which states $$ L^2 - 4\pi A \ge \pi^2 (r_{out} - r_{in})^2, $$ where $L$ is the length and $A$ is the enclosed area of a simple planar c …
Mark Meckes's user avatar
  • 11.4k
2 votes

Levy's isoperimetric inequality for sphere

A different symmetrization-based proof is given in this review article by Schechtman (pp. 7-8); see the previous page for references.
Mark Meckes's user avatar
  • 11.4k