Glen Wheeler
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 Jan13 comment Proof of Wirtinger inequality This is not weaker. It does not require $f(b) = 0$. Dec2 awarded Yearling Nov19 awarded Taxonomist Sep30 awarded Explainer Aug17 awarded Necromancer Jul28 awarded Nice Answer Jul11 comment Soft question: How does basic differential geometry “fit together”? You're not looking for a book recommendation, you just want a high-level map? The problem is that there is no way to fit even just the names and connections between all topics in diff geom on one page. You're going to have to be more specific. Jul2 awarded Curious Jun17 awarded Notable Question Feb10 awarded Good Answer Dec2 awarded Yearling Oct30 revised How solve this equation Tag incorrect Oct30 suggested approved edit on How solve this equation Sep27 awarded Popular Question Sep10 comment How to solve this quasilinear parabolic evolution equation (result of curve shortening flow)? It is just a one dimensional quasilinear parabolic PDE... this is covered by standard theory. Can you explain more which texts you looked at? Did you check Lieberman for example? Sep6 comment Geometric Interpretation: Parallel forms are harmonic See the answer for the first question. For the second: It isn't an arbitrary solution of the Laplacian, it's the Laplacian acting on the volume form. Sep2 comment Geometric Interpretation: Parallel forms are harmonic The fact that the volume form is parallel implies that infinitesimal deformations of the volume form act exactly linearly. Since the Levi-Civita connection controls also the cotangent deformations, this implies that the volume form expands linearly in every possible direction. This is stronger than $\Delta \mu = 0$! May4 awarded Revival Apr12 comment Periodic polynomial? This is wrong -- consider $\prod (1/n)$. Jan1 awarded Nice Question