MathOverflow

0

votes

0

answers

92

views

A paradox on Hilbert spaces and their duals [closed]

11m ago Anand 596●2●11

0

votes

0

answers

112

views

Root systems B_6 versus E_6

root-systems lie-groups lie-algebras

44m ago cmath3.14159 75●5

0

votes

2

answers

196

views

Weyl’s Equidistribution Theorem and Measure Theory…

measure-theory nt.number-theory

52m ago Asaf 253●4

4

votes

0

answers

128

views

The 8-year-old Finiteness Conjecture on homogeneous Einstein metrics and special geometries

dg.differential-geometry riemannian-geometry rt.representation-theory spin-geometry complex-geometry

56m ago cmath3.14159 75●5

1

vote

0

answers

12

views

Complexity of matching red and blue points in the plane.

computational-geometry mg.metric-geometry algorithms reference-request

1h ago Thomas Richard 483●2●7

0

votes

1

answer

253

views

Conjecture: “Neretin polynomials” for a normalized Schwarzian have integer coefficients

polynomials

1h ago Tom Copeland 255●1●9

5

votes

2

answers

291

views

an example of a Morse-Bott function

at.algebraic-topology dg.differential-geometry

1h ago Liviu Nicolaescu 1,127●1●7

4

votes

1

answer

415

views

The Guinand-Weil explicit formula without entire function theory

ca.analysis-and-odes nt.number-theory sp.spectral-theory

1h ago pm 2,895●5●15

7

votes

1

answer

146

views

Smoothability of compact Alexandrov surfaces with curvature bounded from below.

dg.differential-geometry mg.metric-geometry alexandrov-geometry

1h ago Vitali Kapovitch 2,320●1●5●15

1

vote

0

answers

18

views

Defining $\mathbb{Z}^*$ in $\prod_p \mathbb{F}_p/\mathcal{U}$ (or pseudo-finite fields)

model-theory nt.number-theory

1h ago Ali Bleybel 495●1●1●8

0

votes

0

answers

17

views

a question about decomposable ruled surfaces

ag.algebraic-geometry

1h ago Miyako Nara 1

0

votes

0

answers

36

views

matrix diffrentiation

determinants

2h ago Abeer 1

0

votes

0

answers

208

views

The functor category Funct(R-Mod, S-Mod)

ct.category-theory modules

3h ago loronegro 35●3

1

vote

3

answers

131

views

Ultraproduct $\prod_p \mathbb{F}_p/\sim$ and $\mathbb{Q}^*$

model-theory

4h ago ACL 2,019●4●12

1

vote

1

answer

91

views

Algorithm on winning strategy of Winner (Simplified card game)

game-theory

4h ago Guillaume Brunerie 1,566●3●16

0

votes

0

answers

111

views

Question Re: Arian Berdellima’s Papers On Odd Perfect Numbers

nt.number-theory open-problem

5h ago Arnie Dris 141●9

0

votes

1

answer

87

views

Combinatoric problem with the development of intersection of union of events

co.combinatorics

5h ago Srilakshmi 31●4

10

votes

11

answers

3k

views

What is the indefinite sum of tan(x)?

sequences-and-series functional-equations

5h ago Ascold Caves 1

3

votes

0

answers

53

views

Homology generated by lifts of simple curves

at.algebraic-topology gt.geometric-topology

5h ago Julien Marché 273●1●4

3

votes

3

answers

378

views

Using Vinogradov’s theorem for finding prime solutions to a linear equation (an exercise from Vaughan’s book)

nt.number-theory analytic-number-theory

5h ago Tal Horesh 51●5

5

votes

1

answer

682

views

Infimum of the Dirichlet form for a tensor product

pr.probability quadratic-forms

6h ago MathOverflow♦ 1●2●3

4

votes

1

answer

119

views

request sources about self-dual cyclic codes

coding-theory finite-fields

6h ago Zahra 69●4

0

votes

1

answer

195

views

Exterior Product of module sheaves

ag.algebraic-geometry

6h ago Martin Brandenburg 18.6k●22●81

7

votes

1

answer

270

views

Is every finite group a quotient of the Grothendieck-Teichmuller group?

galois-theory nt.number-theory ag.algebraic-geometry

6h ago Adrien 934●1●2●9

1

vote

0

answers

50

views

Decomposition of $f^{*}T_X$ for a morphism $f:\mathbb{P}^1 \rightarrow X$

ag.algebraic-geometry

7h ago Luca Benzo 113●4

1

vote

0

answers

44

views

Orbits of the action of $A_6$ on $\mathbb{P}_2$

ag.algebraic-geometry complex-geometry

8h ago Ru 155●6

15

votes

1

answer

758

views

History of connections

dg.differential-geometry ho.history-overview

8h ago Giuseppe 1,405●2●12

7

votes

0

answers

350

views

Defining $\mathbb{Z}$ in $\mathbb{Q}$

model-theory nt.number-theory

9h ago Ali Bleybel 495●1●1●8

10

votes

1

answer

606

views

Prime numbers dividing the orders of the sporadic groups

gr.group-theory prime-numbers

9h ago Shripad 155●5

5

votes

0

answers

61

views

Higher-dimensional algebraic subgroups of the proalgebraic Nottingham group?

algebraic-groups profinite-groups gr.group-theory nt.number-theory arithmetic-dynamics

10h ago Lubin 882●3●9

5

votes

5

answers

270

views

Positive but not completely positive?

oa.operator-algebras c-star-algebras complete-positivity

11h ago RSG 1

0

votes

0

answers

41

views

Is the inverse operation on an ordered division ring continuous?

ra.rings-and-algebras

12h ago Ricky Demer 5,062●4●23

4

votes

1

answer

164

views

Embedding torus in space such that its 6-fold symmetry extends

gt.geometric-topology

12h ago Lucy 41●4

18

votes

1

answer

293

views

chromatic number of the hyperbolic plane

co.combinatorics dg.discrete-geometry graph-colorings hyperbolic-geometry

12h ago Agol 14.1k●1●15●52

2

votes

0

answers

332

views

Induced map on algebraic de Rham cohomology

ag.algebraic-geometry ac.commutative-algebra

14h ago Ray Hoobler 41●1

7

votes

0

answers

74

views

Ratio of circumscribed/inscribed $(n{-}1)$-gons

mg.metric-geometry geometry euclidean-geometry plane-geometry discrete-geometry

15h ago Joseph O'Rourke 26.6k●1●27●132

9

votes

1

answer

774

views

+250

Why should the anabelian geometry conjectures be true?

ag.algebraic-geometry anabelian-geometry intuition

15h ago Makhalan Duff 2,870●1●28

11

votes

0

answers

312

views

Splitting of homomorphism from cactus group to permutation group

qa.quantum-algebra cactus-groups braid-groups braided-monoidal-categori operads

16h ago François G. Dorais♦ 17.4k●1●39●88

27

votes

3

answers

2k

views

Is there an “elegant” non-recursive formula for these coefficients? Also, how can one get proofs of these patterns?

sequences-and-series taylor-series fourier-analysis fa.functional-analysis co.combinatorics

16h ago Richard Stanley 9,560●1●49●75

2

votes

0

answers

36

views

When are time changes of Feller-Dynkin processes still Feller-Dynkin processes?

pr.probability stochastic-processes

16h ago Shawn 91●4

24

votes

2

answers

374

views

Bodies of constant width?

discrete-geometry combinatorial-geometry convex-polytopes

16h ago Joseph O'Rourke 26.6k●1●27●132

2

votes

2

answers

143

views

What sort of structure can amorphous sets support?

lo.logic set-theory axiom-of-choice

16h ago Noah S 930●2●11

4

votes

0

answers

141

views

If F: mod-A --> D(B-mod) is a fully faithful functor (from a category of modules to the derived category of a ring) which takes A to a projective module is F(mod-A) contained in B-mod?

derived-category triangulated-categories ag.algebraic-geometry ra.rings-and-algebras morita-theory

16h ago Tyler Lawson 14.4k●1●32●74

19

votes

1

answer

1k

views

Largest prime divisor of a sum

nt.number-theory

17h ago MathOverflow♦ 1●2●3

3

votes

1

answer

118

views

Sizes of twisted conjugacy classes of $PSL(n,q)$

finite-groups gr.group-theory

17h ago Jim Humphreys 14k●19●54

2

votes

2

answers

112

views

Solving a system of equations/inequalities that have trigonometric functions on the left-hand side

symbolic-computation computer-algebra linear-programming nonlinear-programming

17h ago zeb 2,493●1●8●20

2

votes

2

answers

154

views

Existence, uniqueness, and regularity for linear parabolic PDE on a complete Riemannian manifold

riemannian-geometry dg.differential-geometry ap.analysis-of-pdes

18h ago Martin Gisser 253●1●8

3

votes

1

answer

87

views

When can a family of polynomials get a weight function to be made orthogonal?

orthogonal-polynomials

18h ago Henry Cohn 3,331●1●9●23

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