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0 answers
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Let ${A_n}$ be one set sequence, why $\varliminf_{n\rightarrow \infty}A_n=\bigcup_{n=1}\bigcap_{k=n}A_n$

2 votes
0 answers
9 views

Binary iterations, Fibonacci numbers and permutation of natural numbers

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0 answers
8 views

finite subgroup of non perfect group

10 votes
6 answers
3k views

Explicit Spin Structures on the Torus

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0-framed smoothly slice knot that can be obtained by blowing down successively a link of unknots

1 vote
2 answers
101 views

Reference for an easy lemma on homeomorphisms of connected manifolds

2 votes
1 answer
158 views

A question about complex Laplacian on compact Hermitian manifolds

3 votes
1 answer
152 views

Has any one seen this sum of roots of unity before?

0 votes
1 answer
19 views

Unital subrings of simple Artinian rings

5 votes
1 answer
311 views

Did Euler know (unconsciously) to integrate by differentiating?

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86 views

Trace of matrices and cyclotomic fields

2 votes
0 answers
17 views

Can any POVM be induced by a quantum instrument?

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1 answer
52 views

Full matrix ring over an infinite division ring with a finite maximal unital subring?

3 votes
1 answer
125 views

Invariants of general linear groups under torus action

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