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earned this badge 5 times
Awarded jan 17 at 19:18
Awarded dec 5 '12 at 17:20
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?
Awarded apr 29 '12 at 0:35
What's an example of a locally presentable category “in nature” that's not $\aleph_0$-locally presentable?
Awarded may 7 '11 at 2:20
Awarded dec 4 '10 at 16:35