User Mircea

48

35

votes

15

answers

10k

views

Geometric imagination of differential forms

Mar 3 at 17:30 Matthias 166

12

22

votes

2

answers

2k

views

Examples of loss of regularity by “creation of topology”

ca.classical-analysis-and-odes dg.differential-geometry fa.functional-analysis differential-topology

Feb 3 '13 at 7:31 Filippo Alberto Edoardo 5,361

7

20

votes

3

answers

1k

views

nontrivial $\pi_2(\textrm{Diff}(M))$

at.algebraic-topology homotopy-theory

Jun 17 at 10:10 YCor 44.8k

3

11

votes

2

answers

596

views

Which curves and surfaces are realizable by linkages? references?

reference-request graph-theory mg.metric-geometry open-problems linkage

May 18 '20 at 13:23 Tom Mrowka 2,429

4

10

votes

3

answers

3k

views

Defining the slowest divergent series

divergent-series nonstandard-analysis heuristics sequences-and-series

Oct 27 at 22:41 Milo Moses 2,069

5

9

votes

1

answer

807

views

What would the best treatment of Gehring's lemma look like?

ca.classical-analysis-and-odes ap.analysis-of-pdes inequalities regularity reference-request

Jul 21 '11 at 16:29 fedja 48.8k

1

8

votes

1

answer

205

views

Is there a non-atomic finite positive measure in the plane, of which uncountably many projections have atoms?

co.combinatorics measure-theory geometric-measure-theory infinite-combinatorics

May 11 '18 at 15:47 Piotr Hajlasz 21.1k

2

7

votes

0

answers

71

views

Graphs all of whose cuts are positive

reference-request co.combinatorics graph-theory terminology

Aug 13 '20 at 22:49 RobPratt 2,837

2

7

votes

2

answers

627

views

are stable holomorphic bundles over compact Kähler manifolds simple?

ag.algebraic-geometry reference-request kahler-manifolds

Jul 26 '13 at 20:42 Misha Verbitsky 6,549

6

7

votes

3

answers

934

views

Moser regularity proof avoiding John-Nirenberg lemma

reference-request elliptic-pde ap.analysis-of-pdes

Mar 25 '12 at 18:07 Connor Mooney 3,776

2

7

votes

4

answers

671

views

Are there good product rules on the $k$-sphere?

reference-request differential-topology

Oct 1 '10 at 0:54 Tom Goodwillie 46.6k

4

votes

0

answers

46

views

How are these “Voronoi-dual” configurations called?

reference-request discrete-geometry convex-geometry terminology

Jul 9 '20 at 15:10 RobPratt 2,837

4

votes

1

answer

310

views

interval exchange maps and surfaces

gt.geometric-topology ds.dynamical-systems

May 24 '12 at 14:36 Daniel Moskovich 20.8k

2

4

votes

1

answer

524

views

criterion for being a curvature

dg.differential-geometry

Dec 5 '11 at 13:24 Robert Bryant 92.7k

2

4

votes

2

answers

1k

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Trace space and Neumann boundary condition

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

Oct 8 '10 at 6:52 Denis Serre 44.5k

4

votes

1

answer

254

views

Criterion for being a simple vector

co.combinatorics hyperplane-arrangements exterior-algebra reference-request

Apr 26 '10 at 11:37 David E Speyer 130k

1

3

votes

0

answers

84

views

What is a $C^\infty$ diffeomorphism from $\ell_2\setminus\{0\}$ to $\ell_2$ which is the identity outside a ball?

reference-request fa.functional-analysis hilbert-spaces hilbert-manifolds

Oct 12 '19 at 22:15 Mircea 1,971

3

votes

0

answers

51

views

Selfsimilar lattices in $\mathbb R^d$

lattices euclidean-lattices self-similarity

May 1 '19 at 16:23 Mircea 1,971

2

votes

0

answers

57

views

Infinitesimal rigidity vs local rigidity of isometrically immersed riemannian manifolds

mg.metric-geometry rigidity

Jan 11 at 16:21 Mircea 1,971

2

votes

0

answers

141

views

theories where angles exist without a metric

reference-request model-theory euclidean-geometry axioms incidence-geometry

Aug 7 '18 at 0:09 Mircea 1,971

1

2

votes

2

answers

437

views

solvability of an elementary functional equation

functional-equations

Mar 13 '16 at 14:39 Adam 415

2

votes

0

answers

99

views

rigidity of isoradial graphs

combinatorial-geometry

Apr 25 '13 at 7:49 Mircea 1,971

2

votes

0

answers

105

views

candidates for “projection” of the trace of a set onto the associated perimeter minimizer

geometric-measure-theory reference-request

Feb 2 '12 at 13:54 Mircea 1,971

1

vote

0

answers

172

views

iterated traces for sobolev functions

fa.functional-analysis ca.classical-analysis-and-odes

Mar 19 '12 at 13:47 Mircea 1,971

0

votes

1

answer

86

views

When do there exist locally regular embeddings of regular graphs?

combinatorial-geometry reference-request

Jul 9 '12 at 14:19 Anton Petrunin 36.6k

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25 Questions

Geometric imagination of differential forms

Examples of loss of regularity by “creation of topology”

nontrivial $\pi_2(\textrm{Diff}(M))$

Which curves and surfaces are realizable by linkages? references?

Defining the slowest divergent series

What would the best treatment of Gehring's lemma look like?

Is there a non-atomic finite positive measure in the plane, of which uncountably many projections have atoms?

Graphs all of whose cuts are positive

are stable holomorphic bundles over compact Kähler manifolds simple?

Moser regularity proof avoiding John-Nirenberg lemma

Are there good product rules on the $k$-sphere?

How are these “Voronoi-dual” configurations called?

interval exchange maps and surfaces

criterion for being a curvature

Trace space and Neumann boundary condition

Criterion for being a simple vector

What is a $C^\infty$ diffeomorphism from $\ell_2\setminus\{0\}$ to $\ell_2$ which is the identity outside a ball?

Selfsimilar lattices in $\mathbb R^d$

Infinitesimal rigidity vs local rigidity of isometrically immersed riemannian manifolds

theories where angles exist without a metric

solvability of an elementary functional equation

rigidity of isoradial graphs

candidates for “projection” of the trace of a set onto the associated perimeter minimizer

iterated traces for sobolev functions

When do there exist locally regular embeddings of regular graphs?