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# Questions

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### Does this formula have a rigorous meaning, or is it merely formal.

jan 8 12 at 21:17 Andrey Rekalo 13.9k13268

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### Euler Characteristic of a manifold with non-vanishing vector field,

sep 11 10 at 18:57 Dmitri 16.5k13677

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### When are two symplectic forms “isotopic”?

mar 5 11 at 20:37 Elizabeth S. Q. Goodman 1,064616

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### When are the eigenspaces of the Laplacian on a compact homogeneous space irreducible representations?

feb 19 12 at 3:46 Sigurdur Helgason 34154

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### Is there a name for sets for which it is easier to test membership than to find members---and vice versa?

jan 7 11 at 15:23 Timothy Chow 14.4k168137

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### Is this formulation of the Singular Value Decomposition standard?

jan 7 11 at 13:43 Denis Serre 18.7k13193

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### Are these Two Definitions of Uniformly Distributed" Equivalent?

may 19 11 at 11:18 Johann Cigler 1,500414

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### If $f:R^n \to R$ is a smooth real-valued function such that $\nabla f : R^n \to R^n$ is a diffeomorphism, what can one conclude about the behavior of $f(x)$ at infinity?

dec 4 10 at 11:45 Theo Buehler 3,66611125

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### Invariant measures for $1$-dimensional discrete dynamical systems

sep 13 10 at 9:15 Ian Morris 1,938716

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