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Answers
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2
Bertrand theorem - central forces
1
Nice Classes of Non-Closable Operators
3
Local linearization of ODE at singular point
4
Are there other nice math books close to the style of Tristan Needham?
2
What’s your favorite equation, formula, identity or inequality?
6
Strengthening the Induction Hypothesis
6
Eigenvectors of a certain big upper triangular matrix
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Undergraduate Level Math Books
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Geodesics on a hyperbolic paraboloid
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A plausible inequality.
2
If the second derivative of a function on $\mathbb R^n$ is everywhere nondegenerate, does it follow that the first derivative is an injection?