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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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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 $$\lVert(a_{ij})\rVert \le C \Bigl\lVert\s...
Mathoverflow.net news digest
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0 days
Does the PNT-scale asymptotic justify this derivation for prime gaps?
Let $p_n$ be the $n$th prime, and define
$$g_n:=p_{n+1}-p_n.$$
The Prime Number Theorem gives -
0 days
Is there any benefit from writing homomorphisms on the same side as the module/g...
Let $R$ be a ring, and let $M_R$ and $N_R$ be right $R$-modules. I was taught to always write module homomorphisms on the opposite side from scalars. Thus, a map $\varphi\in {\rm Hom}_R(M,N)$ would be written on the left side of elements of $M$. The...
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0 days
Can we paraphrase constructible sets as object predicates?
This question is linked to a prior one.
Language: Mono-sorted first order logic with equality and additional primitives of $\xi$ signifying is the order of, and the binary relation $ [ \ ] $ signifying predication that is $p[x]$ to be read as $p$ predicates $x$, or equivalently as $x$ is predicated... -
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Rational solutions to $x^3+y^3=z^3+1$ with $xyz=\square$, and the equation $X^6+...
In my investigation on higher power Diophantine triples (arxiv, related MO question), I considered the following equation in rationals$$\tag{1} \label{cubic_sum_square_product}x^3+y^3=z^3+1, \\xyz=\square,$$where by $\square$ I mean a rational square...
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