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Complex, contact, Riemannian, pseudo-Riemannian and Finsler geometry, relativity, gauge theory, global analysis.

10 votes

Volume of manifolds embedded in $\mathbb{R}^n$

Yes if $N$ is convex - the flow will even increase or decrease distances. No if not convex, looking at $n=2$. The curve length of those parts of $N$ that are concave with respect to $X$ will decrease, …
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7 votes
Accepted

Holonomy bounded in terms of area and the curvature

There are in fact more precise versions, expressing the parallel translation around a loop as the identity map plus a curvature integral over a homotopy. References: Section 3.1 of Werner Ballmann's l …
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4 votes

The existence of length-minimizing path between two points in a Riemannian manifold with bou...

Alexander, Berg, Bishop: The Riemannian obstacle problem. https://projecteuclid.org/download/pdf_1/euclid.ijm/1255989406
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2 votes

Groups of conformal isomorphisms of simply connected surfaces

After postcomposing with a suitable Möbius transformation one can assume that f maps infinity to infinity. So f is an entire function on the complex plane. By Casorati-Weierstrass (or Picard), it cann …
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