First to answer and accepted with score of 10 or more. This badge can be awarded multiple times.
earned this badge 4 times
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