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Q&A for professional mathematicians
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Hottest Questions Today - MathOverflow
Skip to main content Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, ...
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I hope everyone is doing well. Let $K \subset \mathbb{R}^n$ be a centrally symmetric convex body $(K = -K)$. Denote by $K \mid H$ the orthogonal projection of $K$ onto $H$, where $H$ is an $n - 1$
Mathoverflow.net news digest
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0 days
Definition of a holomorphic coordinate chart
A complex manifold is said to admit a holomorphic coordinate chart around a point if there exists a neighborhood (U) of the point and a map[\phi : U \to \mathbb{C}^n]such that (\phi) is a homeomorphism onto its image and the transition maps between overlapping...
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5 years
Great graduate courses that went online recently
In 09.2020 by pure chance I discovered the YouTube channel of Richard Borcherds where he gives graduate courses in Group Theory, Algebraic Geometry, Schemes, Commutative Algebra, Galois Theory, Lie Groups, and Modular forms! (and an undergraduate courses...
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0 days
Gagliardo–Nirenberg inequalities for Orlicz spaces
I am looking for reference for inequalities of the following form where all spaces are taken on bounded domains subset of $\mathbb{R}^d$ with regular boundaries:
$$|u|_{L^2}≤C|u|_{H^1}^{\theta}|u|_{L^{\phi}}^{1-\theta}.$$
E.g. generalized Gagliardo–Nirenberg inequalities using Orlicz spaces in a very special case.... -
7 months
Quandle colorings under connected sum
Can you give me an example of a quandle $Q$ and a knot $K$ such that $K$ only has trivial $Q$-colorings but $K\#K$ has nontrivial $Q$-colorings?
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| Updated: | May 11, 2026 |
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| Created: | July 14, 2009 |
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