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Q&A for professional mathematicians
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Let $A$ be a $C^*$-algebra and $(a_{ij}) \in M_n(A)$ be a positive matrix. Does there exist a constant $C \ge 0$ (not depending on the $a_{ij}$) such that $$\lVert(a_{ij})\rVert \le C \Bigl\lVert\s...
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Hottest Questions Today - MathOverflow
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Transfinite recursion on boundaries of separators
In classical large inductive dimension (Ind), a space X has Ind(X) ≤ n if every pair of disjoint closed sets can be separated by a closed set C with Ind(∂C) ≤ n−1. This already recurses on the boundary of the separator.I propose a closely related but...
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Maximal disjoint but not a complement in $\text{Sub}(H)$ for linear hypergraph $...
If $H=(V,E)$ is a hypergraph, we say that $T\subseteq V$ is a subspace with of $H$ if whenever $a,b\in T$ with $a\neq b$, then $e\subseteq T$ for every $e\in E$ having $\{a,b\}\subseteq e$. By $\newcommand{\S}{\text{Sub}}\S(H)$ we mean the collection...
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There are $n$ finite queues, each one of length drawn independently from a known probability distribution $D$. You can't see how long they are. Your access to the queues is restricted to queries of the form POP($i$), which either gives you the element...
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Preprint repositories that allow papers in any language
I was wondering what are some repositories for math preprints that do not impose a particular language X as the primary language. I mean, where perhaps a summary in language X is required, but where they do not require a full version in language X as...
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| Updated: | July 07, 2025 |
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| Created: | July 14, 2009 |
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