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Jason DeVito earned this badge 12 times
may 6 at 16:54If $f: M\to M$ an isometry, is $f$ bijective?
mar 17 at 14:59Smooth Poincaré Conjecture
dec 20 at 15:34Functions with no closed-form derivative
jun 2 '12 at 20:30Is it true that fundamental group of a manifold with boundary can't be simple? If so, why?
feb 22 '12 at 17:29Can there exist a non-constant continuous function that has a derivative of zero everywhere?
dec 8 '11 at 18:32Sum of infinite divergent series
sep 9 '11 at 18:04Little Bézout theorem for smooth functions
may 12 '11 at 13:41Ways in which a manifold can be geodesically incomplete
feb 17 '11 at 21:00Why is $\omega$ the smallest $\infty$?
dec 1 '10 at 8:36Is there an easy way to show which spheres can be Lie groups?
aug 2 '10 at 14:25Are there more rational numbers than integers?