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What is the tag for? It has no tag wiki. There are relatively few questions using this tag, and I'm not sure how they relate to each other.

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  • $\begingroup$ I would expect Morse theory, see Guillemin and Pollack. That's not to say people would use it correctly. $\endgroup$ – Will Jagy Dec 18 '13 at 6:36
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A lot of the questions are using it wrong. I'll re-tag and write up a tag wiki in a bit. Thanks for bringing it to our attention.

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If a tag is good enough for Tao, it's good enough for MSE.

Seriously: although I'm not a fan of tags named after mathematical objects (rather than areas), this one appears to be used correctly: for dynamical systems of the kind $\dot x=-\nabla U(x)$, where $x$ can be a vector, or a function, or a point on manifold, or a manifold itself... There is a certain common theme here, although the problems come from several fields: PDE, Riemannian geometry / geometric analysis, calculus of variations, some applied math (e.g. image processing).

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    $\begingroup$ Isn't it possible that a tag good enough for Terry Tao is too good for MSE? $\endgroup$ – user642796 Dec 18 '13 at 7:47

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