Recent Questions

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spectrum of operator

fa.functional-analysis
28m ago Yemon Choi 6,189●1●13●35
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0
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33
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n vertices “span” an (n-1)-simplex, called a face … is this the same “span” we mean in linear algebra? [closed]

algebraic topology
1h ago Shao Qin 1
0
votes
0
answers
35
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Intersection of curves

intersection-theory
1h ago mfn 1●1
2
votes
2
answers
125
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partition into the orbits of a dynamical system

ergodic-theory
1h ago Vaughn Climenhaga 2,868●1●5●20
8
votes
2
answers
395
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Dedekind Zeta function: behaviour at 1

nt.number-theory zeta-functions
1h ago Peter Humphries 976●1●8●14
1
vote
0
answers
91
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Classifying space commutes with geometric realization - reference request

algebraic-topology reference-request
2h ago David White 2,003●1●10●23
2
votes
3
answers
62
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Which functors between multicategories that come from monoidal categories are monoidal?

ct.category-theory
2h ago David White 2,003●1●10●23
0
votes
0
answers
41
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A calculus question with limit and improper integral [closed]

calculus
2h ago Sun 1
4
votes
4
answers
2k
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What is the situation with Hilbert’s Fifth Problem ?

ho.history-overview lie-groups topological-groups
3h ago Ashwath 11●1
4
votes
4
answers
91
views

Coproduct on coordinate ring of finite algebraic group

ag.algebraic-geometry algebraic-groups
4h ago Rami 262●5
1
vote
0
answers
38
views

Analogues of Jacobsthal’s function

nt.number-theory
4h ago Timothy Foo 648●6
7
votes
1
answer
168
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The coproduct on the cohomology of a Hopf algebra

reference-request hopf-algebras cohomology
5h ago Ralph 3,674●3●13
0
votes
0
answers
139
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Sigma algebra generated

measure-theory real-analysis
5h ago Santos 11●2
1
vote
2
answers
152
views

Can we approximate an arbitrary function as a (probably infinite) sum of bell shapes?

ca.analysis-and-odes fa.functional-analysis
5h ago Zander 148●4
6
votes
6
answers
334
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Positive but not completely positive?

oa.operator-algebras c-star-algebras complete-positivity
5h ago Jon Bannon 2,568●1●7●31
1
vote
0
answers
53
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Base change for invariants [closed]

ac.commutative-algebra invariant-theory
5h ago anon 11●1
49
votes
2
answers
3k
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Norms of Commutators

matrices fa.functional-analysis banach-algebras oa.operator-algebras banach-spaces
5h ago Bill Johnson 10.9k●1●26●55
1
vote
0
answers
84
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Guessing the next card colour in a deck [closed]

pr.probability
5h ago A Chuh 61●3
-1
votes
0
answers
77
views

2-metric spaces [closed]

mg.metric-geometry
5h ago tplcgn 1
5
votes
2
answers
174
views

The sequence $a_{n+1}=$ the greatest prime factor of $(xa_n+y)$

analytic-number-theory prime-numbers nt.number-theory
5h ago LLLLL 51●2
0
votes
0
answers
90
views

Hurwitz integers and $F_4$

nt.number-theory reference-request diophantine-equations lattices quadratic-forms
6h ago emiliocba 331●1●6
25
votes
5
answers
1k
views

What is the significance of non-commutative geometry in mathematics?

noncommutative-geometry reference-request big-picture
6h ago Jon Bannon 2,568●1●7●31
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