User Mircea

36 votes

15 answers

11k views

Geometric imagination of differential forms

asked Jun 3, 2010 at 17:34

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

asked May 21, 2010 at 15:57

21 votes

3 answers

1k views

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

at.algebraic-topology homotopy-theory

asked May 24, 2012 at 10:29

11 votes

2 answers

631 views

Which curves and surfaces are realizable by linkages? references?

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

asked May 3, 2020 at 14:25

10 votes

3 answers

3k views

Defining the slowest divergent series

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

asked Dec 15, 2011 at 10:31

10 votes

1 answer

874 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

asked Jul 18, 2011 at 10:37

8 votes

2 answers

708 views

are stable holomorphic bundles over compact Kähler manifolds simple?

ag.algebraic-geometry reference-request kahler-manifolds

asked Jul 25, 2013 at 21:15

8 votes

1 answer

216 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

asked May 11, 2018 at 15:04

7 votes

3 answers

1k views

Moser regularity proof avoiding John-Nirenberg lemma

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

asked Mar 22, 2012 at 7:55

7 votes

4 answers

678 views

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

reference-request differential-topology

asked Jul 23, 2010 at 12:10

7 votes

0 answers

73 views

Graphs all of whose cuts are positive

reference-request co.combinatorics graph-theory terminology

asked Aug 13, 2020 at 22:13

4 votes

0 answers

48 views

How are these "Voronoi-dual" configurations called?

reference-request discrete-geometry convex-geometry terminology

asked Jul 9, 2020 at 15:01

4 votes

2 answers

1k views

Trace space and Neumann boundary condition

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

asked Oct 7, 2010 at 16:14

4 votes

1 answer

530 views

criterion for being a curvature

dg.differential-geometry

asked Dec 2, 2011 at 10:38

4 votes

1 answer

258 views

Criterion for being a simple vector

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

asked Apr 26, 2010 at 10:49

4 votes

1 answer

318 views

interval exchange maps and surfaces

gt.geometric-topology ds.dynamical-systems

asked May 24, 2012 at 10:19

3 votes

0 answers

51 views

Selfsimilar lattices in $\mathbb R^d$

lattices euclidean-lattices self-similarity

asked May 1, 2019 at 16:23

3 votes

0 answers

107 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

asked Oct 12, 2019 at 22:15

2 votes

0 answers

65 views

Infinitesimal rigidity vs local rigidity of isometrically immersed riemannian manifolds

mg.metric-geometry rigidity

asked Jan 10, 2021 at 17:01

2 votes

0 answers

100 views

rigidity of isoradial graphs

combinatorial-geometry

asked Apr 24, 2013 at 19:48

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

asked Feb 2, 2012 at 13:54

2 votes

0 answers

144 views

theories where angles exist without a metric

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

asked Aug 6, 2018 at 23:43

2 votes

2 answers

438 views

solvability of an elementary functional equation

functional-equations

asked Apr 5, 2011 at 10:16

1 vote

0 answers

174 views

iterated traces for sobolev functions

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

asked Mar 19, 2012 at 13:47

0 votes

1 answer

86 views

When do there exist locally regular embeddings of regular graphs?

combinatorial-geometry reference-request

asked Jul 9, 2012 at 13:56

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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?

are stable holomorphic bundles over compact Kähler manifolds simple?

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

Moser regularity proof avoiding John-Nirenberg lemma

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

Graphs all of whose cuts are positive

How are these "Voronoi-dual" configurations called?

Trace space and Neumann boundary condition

criterion for being a curvature

Criterion for being a simple vector

interval exchange maps and surfaces

Selfsimilar lattices in $\mathbb R^d$

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

Infinitesimal rigidity vs local rigidity of isometrically immersed riemannian manifolds

rigidity of isoradial graphs

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

theories where angles exist without a metric

solvability of an elementary functional equation

iterated traces for sobolev functions

When do there exist locally regular embeddings of regular graphs?