MathOverflow

1

vote

2

answers

39

views

decomposition of the injective hull of a torsion free module

modules

7m ago Paslig Keir 13

4

votes

3

answers

98

views

objects which can’t be defined without making choices but which end up independent of the choice

gm.general-mathematics lo.logic

14m ago Tony Huynh 8,873●1●22●62

0

votes

1

answer

77

views

Heisenberg Lie algebras

lie-algebras

22m ago Dietrich Burde 1,805●3●12

1

vote

2

answers

112

views

Real root of a cubic equation

algebraic-equations

30m ago Barry Cipra 3,204●1●8●18

0

votes

0

answers

4

views

Bounds on the crossing numbers of de Bruijn graphs and some incidence graphs

topological-graph-theory graph-theory algebraic-graph-theory

33m ago Guillermo Pineda-Villavicencio 65●3

0

votes

0

answers

65

views

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

nt.number-theory selberg-class

38m ago Sylvain JULIEN 661●3●10

3

votes

1

answer

92

views

Hyperbolic sets

ds.dynamical-systems reference-request

1h ago Pengfei 888●2●7

2

votes

1

answer

38

views

Borel constructions, equivariant cohomology, and homotopy quotients of monoid actions.

at.algebraic-topology equivariant-cohomology homotopy-theory reference-request

1h ago Oscar Randal-Williams 5,145●1●12●26

11

votes

0

answers

243

views

Octonions and the Fano plane.

octonions projective-plane riemann-surfaces combinatorial-designs

1h ago Drew Armstrong 111

16

votes

1

answer

465

views

Yitang Zhang’s preprint on Landau-Siegel zeros

nt.number-theory

1h ago unknown (google) 11

2

votes

2

answers

77

views

Surfaces ruled over elliptic curves

ag.algebraic-geometry algebraic-surfaces elliptic-surfaces elliptic-curves

1h ago Sándor Kovács 23.7k●2●52●73

0

votes

1

answer

100

views

Hartogs Theorem and Canonical Bundles

ag.algebraic-geometry dg.differential-geometry complex-geometry

2h ago Karl Schwede 11.3k●1●14●35

0

votes

1

answer

56

views

Determine the probability that two random vectors over a finite field are orthogonal

linear-algebra random-matrices

2h ago Douglas Zare 13.1k●3●36●58

2

votes

2

answers

194

views

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

lo.logic peano-axioms peano-arithmetic

2h ago Emil Jeřábek 10.6k●1●24●41

0

votes

0

answers

42

views

Monoidal category

ct.category-theory

2h ago anton 2,392●7●12

1

vote

0

answers

20

views

Joint distribution from multiple marginals

st.statistics probability-distributions bernoulli-trial pr.probability

2h ago Angelorf 11

3

votes

1

answer

83

views

The first eigenvalue of the Schrödinger operator is simple.

dg.differential-geometry sp.spectral-theory

2h ago Kofi 1,157●2●8

1

vote

0

answers

41

views

Karoubi versus Kasparov K-theory

kt.k-theory-homology linear-algebra clifford-algebras index-theory

2h ago Johannes Ebert 11.4k●33●55

2

votes

0

answers

43

views

How to cite a sequence from The On-Line Encyclopedia of Integer Sequences (OEIS)?

citations publishing oeis

2h ago Piotr Migdal 647●3●11

0

votes

0

answers

32

views

Need an explanation of this paragraph “Lebesgue Homoeomorphism”

measure-theory

2h ago Dayana Chesslo 1

3

votes

2

answers

162

views

Algebraic closure of a polynomial ring

polynomials ac.commutative-algebra

2h ago Goldstern 5,250●1●12●27

1

vote

0

answers

104

views

Algebraic Independence of Polynomials in n Variables with Real Coefficients

polynomials linear-algebra ac.commutative-algebra

2h ago Goldstern 5,250●1●12●27

2

votes

0

answers

87

views

Lang isogeny for group stacks

ag.algebraic-geometry algebraic-stacks positive-characteristic

3h ago Justin Campbell 1,055●4●12

0

votes

0

answers

60

views

exactness of sequence of groups

homological-algebra at.algebraic-topology

3h ago Andriy Regeta 93●3

1

vote

1

answer

42

views

Degree of a finite locally free group scheme over a base scheme of characteristic p

group-schemes

3h ago Keenan Kidwell 1,577●1●6●13

3

votes

0

answers

92

views

Permutations of $(Z/pZ)^*$

co.combinatorics nt.number-theory prime-numbers

4h ago Joël 9,459●19●52

0

votes

0

answers

11

views

Graphs with vertex-separators of size a function of the diameter…

topological-graph-theory graph-theory

4h ago Guillermo Pineda-Villavicencio 65●3

-1

votes

2

answers

187

views

Vector field pull back from embedding [closed]

dg.differential-geometry differential-topology

4h ago Nevermind 270●1●8

2

votes

3

answers

174

views

What’s the definition of continuous of set-valued functions?

gn.general-topology topology continuity

4h ago katz 1,264●1●12

-4

votes

0

answers

80

views

preparation for an entrance(Random ques) [closed]

mathematics-education

5h ago LilVal 1

-4

votes

0

answers

65

views

preparation for an entrance(Random ques) [closed]

mathematics-education

5h ago LilVal 1

12

votes

6

answers

2k

views

Why not evaluate integrals using ODE-solvers?

na.numerical-analysis integration ca.analysis-and-odes

5h ago Candyland 1

2

votes

1

answer

189

views

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

real-analysis fa.functional-analysis

5h ago Jim Beech 21

3

votes

0

answers

87

views

Possible automorphism groups of a K3 surface

ag.algebraic-geometry moduli-spaces k3-surfaces

5h ago André Henriques 14.9k●2●30●83

0

votes

0

answers

21

views

Relation between $H^i_I(-)$ and $H^i_J(-)$ when $I\subset J$

ac.commutative-algebra cohomology commutative-rings

5h ago Nemo 35●4

0

votes

1

answer

82

views

What does “Vertex Solution” mean?

linear-programming

6h ago Brian Borchers 2,423●1●3●8

0

votes

1

answer

84

views

DAG graph and topologic order question

graph-theory

6h ago Deinst 11

0

votes

0

answers

30

views

Centralizers of elementary abelian subgroups of $p$-groups

p-groups centralisers

6h ago Jai Mendas 1

2

votes

1

answer

62

views

Optimization problem - maximizing number of satisfied linear inequalities subject to a quadratic constraint

nonlinear-optimization combinatorial-optimizatio global-optimization

6h ago Mark 117●6

1

vote

0

answers

131

views

Question about the “nullstellensatz” for projective schemes

ag.algebraic-geometry ac.commutative-algebra

7h ago Daniel Barter 732●4●12

1

vote

3

answers

426

views

Finitely generated monoids are finitely presented?

monoids

7h ago Benjamin Steinberg 10.6k●1●14●49

21

votes

4

answers

4k

views

Computing the Galois group of a polynomial

galois-theory

7h ago darij grinberg 12.6k●1●24●75

1

vote

1

answer

137

views

A question about “nice” functions

real-analysis measure-theory

7h ago Tapio Rajala 1,895●1●6●12

15

votes

2

answers

406

views

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

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

8h ago jc 3,915●9●23

13

votes

1

answer

313

views

What are the main structure theorems on finitely generated commutative monoids?

commutative-monoids monoids ac.commutative-algebra

9h ago Benjamin Steinberg 10.6k●1●14●49

27

votes

1

answer

1k

views

Philosophy behind Yitang Zhang’s work on the Twin Primes Conjecture

nt.number-theory prime-numbers

9h ago Mark Lewko 3,981●9●18

1

vote

1

answer

130

views

Who first computed the integral cohomology ring of a weighted projective space (WPS) ?

ag.algebraic-geometry

9h ago Al-Amrani 1

0

votes

0

answers

36

views

Dual space of Bochner space: is there an easier proof to show they’re isometric?

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

9h ago michael_f 1

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