MathOverflow

2

votes

0

answers

27

views

Lawvere’s fixed point theorem and the Recursion Theorem

15m ago Peter LeFanu Lumsdaine 2,645●8●19

0

votes

0

answers

19

views

Toric varieties over positive characteristic field

characteristic-p positive-characteristic toric-varieties ag.algebraic-geometry

56m ago Nikita Kalinin 1,398●4●17

0

votes

0

answers

11

views

affine schubert cells and bruhat order

rt.representation-theory algebraic-groups

59m ago prochet 347●4

0

votes

0

answers

40

views

An integral with Gamma functions (Part 2)

mp.mathematical-physics special-functions complex-analysis fourier-analysis

1h ago S. Sra 10k●1●16●44

0

votes

0

answers

37

views

How do I find abelian subcategories of periodic triangulated categories?

ct.category-theory derived-category triangulated-categories

1h ago Vivek Shende 3,071●7●22

0

votes

0

answers

30

views

Question about the nullstellensatz for projective schemes

ag.algebraic-geometry ac.commutative-algebra

1h ago Daniel Barter 722●4●12

2

votes

5

answers

276

views

Connected groupoids and action groupoids

ct.category-theory groupoids reference-request

2h ago Ronnie Brown 5,209●17●20

4

votes

0

answers

49

views

A duality on partial permutations

co.combinatorics permutations reference-request

2h ago Stefan Kohl 2,600●2●15

41

votes

6

answers

8k

views

How many orders of infinity are there?

lo.logic posets

2h ago Yaoming Shi 1

32

votes

9

answers

2k

views

Why is Set, and not Rel, so ubiquitous in mathematics?

soft-question big-picture relation-algebra ct.category-theory

2h ago Wlodzimierz Holsztynski 772●4●7

5

votes

0

answers

61

views

Octonions and the Fano plane.

octonions projective-plane riemann-surfaces

2h ago Drew Armstrong 51

5

votes

5

answers

890

views

Groupoid actions on spaces

at.algebraic-topology groupoids

3h ago Ronnie Brown 5,209●17●20

2

votes

1

answer

128

views

Set Theory exercise.

set-theory

3h ago Asaf Karagila 7,118●1●14●44

0

votes

0

answers

45

views

DAG graph and topologic order question

graph-theory

3h ago conex 1

2

votes

1

answer

109

views

Is a Cauchy principal value invariant under a “change of variables”?

real-analysis fa.functional-analysis

4h ago Bazin 2,958●2●8

4

votes

2

answers

262

views

Importance of separability vs. second-countability

gn.general-topology soft-question

4h ago Joseph Van Name 1,789●4●11

0

votes

1

answer

27

views

decomposition of the injective hull of a torsion free module

modules

4h ago Dietrich Burde 1,770●3●12

1

vote

1

answer

108

views

exceptional divisor on a smooth surface

ag.algebraic-geometry

5h ago Sándor Kovács 23.7k●2●52●73

14

votes

1

answer

573

views

Under exactly what (extra) conditions (if any) is a connected Hausdorff manifold with a Riemannian metric a metric space?

dg.differential-geometry

5h ago Peter Michor 5,422●10●17

0

votes

0

answers

83

views

Strong convergence in the Bochner space L^p([0,T],X)

fa.functional-analysis ap.analysis-of-pdes parabolic-pde

5h ago Rafa 62●2

0

votes

2

answers

126

views

Vector field pull back from embedding

dg.differential-geometry differential-topology

6h ago John Klein 7,119●19●28

12

votes

3

answers

631

views

Good uses of Siegel zeros?

nt.number-theory analytic-number-theory zeta-functions riemann-zeta-function riemann-hypothesis

6h ago Terry Tao 27.6k●4●107●178

8

votes

5

answers

1k

views

Geodesics on a Grassmannian

dg.differential-geometry

6h ago Peter Michor 5,422●10●17

1

vote

0

answers

17

views

Fundamental cycle separators and crossing numbers

topological-graph-theory graph-theory

6h ago Guillermo Pineda-Villavicencio 65●3

9

votes

0

answers

133

views

How can I randomly draw an ensemble of unit vectors that sum to zero?

pr.probability geometry ag.algebraic-geometry linear-algebra

6h ago Dustin G. Mixon 727●1●8

0

votes

0

answers

25

views

Gradient estimates for subsolutions of elliptic equations

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

6h ago unknown (google) 1

0

votes

0

answers

50

views

Differential form on a compact manifold whose exterior derivative is nowhere zero? [closed]

dg.differential-geometry

6h ago marcelo827 1

2

votes

1

answer

81

views

Is there an “accepted” jamming limit for hard spheres placed in the unit cube by random sequential adsorption?

geometry sphere-packing packing

6h ago Yoav Kallus 1,456●7●14

11

votes

0

answers

232

views

Source of a formula for tensor product multiplicities?

rt.representation-theory lie-algebras reference-request

7h ago Jim Humphreys 25.9k●37●82

-1

votes

0

answers

106

views

What is the exact mathematical formulation of a claim

elliptic-curves

7h ago edpc 1

1

vote

0

answers

68

views

Reference request: construction of Steenrod operations for an odd p

reference-request at.algebraic-topology cohomology

7h ago Serge Lvovski 1,022●1●9

5

votes

1

answer

246

views

Why are affine Lie algebras called affine?

lie-algebras

7h ago Jim Humphreys 25.9k●37●82

0

votes

0

answers

24

views

How to combine correlated signals !?

st.statistics

7h ago Omid1989 1

2

votes

1

answer

119

views

Homological characterization of smooth maps

commutative-rings homological-algebra

7h ago Angelo 19.4k●3●47●75

1

vote

0

answers

46

views

Characterizing a certain subset of isotropic vectors

reference-request projective-geometry linear-algebra at.algebraic-topology

8h ago Henrik Wilming 11

0

votes

0

answers

14

views

shortest path in undirected graph in LogSpace

graph-theory

8h ago Deb 1

2

votes

1

answer

203

views

Derivation of Bessel functions

soft-question differential-equations physics fluid-dynamics classical-mechanics

8h ago d12 23

1

vote

1

answer

102

views

Algorithm to find exponential map of differential operators acting on function

differential-operators oa.operator-algebras lie-algebras computer-algebra

9h ago profiles114421643050705836770 11

3

votes

1

answer

78

views

Volume growth of covers and growth of deck-transformation groups

gr.group-theory riemannian-geometry

9h ago Yves Cornulier 2,926●1●6●11

0

votes

0

answers

57

views

Are the d quantities log(\lambda_j.s+\mu_j) linearly independent over Q for all s>1?

nt.number-theory selberg-class

9h ago Sylvain JULIEN 663●3●10

1

vote

1

answer

106

views

Composition in the category quotient

ct.category-theory

10h ago Marcelo Silva 13

17

votes

7

answers

1k

views

What math institutes offer research in pairs/research in teams?

career

11h ago quid 12.9k●31●51

0

votes

0

answers

27

views

Finding conditions on unspecified CDF that permit a solution to an equation

pr.probability

11h ago Martin 1

5

votes

1

answer

154

views

Reference request: affine transforms + circle inversion?

mg.metric-geometry geometry reference-request

11h ago Robert Bryant 21.8k●3●75●97

7

votes

1

answer

170

views

Is this combination of generalized polygamma and dilogarithm actually zero? $\Im\;\psi^{(-2)}(1+i)+\frac1{4\pi}\text{Li}_2(e^{-2\pi})-\log\sqrt{2\pi}+\frac{5\pi}{24}+\frac12$

special-functions polylogarithms gamma-function closed-form-expressions ca.analysis-and-odes

12h ago joro 4,230●1●10●31

0

votes

1

answer

50

views

The sufficient condition of the Neumann problem

linear-pde

12h ago Andreas Minne 26●2

2

votes

1

answer

57

views

Is the equivalence between a $\Sigma^0_1$ and a $\Pi^0_1$ formula defining the same recursive set provable in a sufficiently strong arithmetic ?

lo.logic descriptive-set-theory reverse-math proof-theory computability-theory

13h ago Joel David Hamkins 74.9k●7●187●343

2

votes

1

answer

154

views

Reference request: Minimal Axiomatizations of PA over (+,x,<=).

lo.logic peano-axioms peano-arithmetic

13h ago abo 689●1●2●6

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