Asaf Shachar's user avatar
Asaf Shachar's user avatar
Asaf Shachar's user avatar
Asaf Shachar
  • Member for 10 years, 2 months
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26 votes
3 answers
2k views

Does isometric immersion map boundary to boundary?

26 votes
1 answer
1k views

Finding the closest matrix to $\text{SO}_n$ with a given determinant

25 votes
1 answer
2k views

Is it possible for a metric on a smooth manifold to be smooth?

24 votes
2 answers
1k views

Is there a smooth manifold which admits only rigid metrics?

23 votes
1 answer
696 views

Which ordered fields are homeomorphic to their power?

21 votes
1 answer
1k views

Differential Topology over $\mathbb{Q}$

21 votes
0 answers
2k views

Characterising critical points of $E(f)=\int_{M}| \bigwedge^2 df|^2 \text{Vol}_{M}$

21 votes
1 answer
1k views

A differentiable isometry is smooth?

20 votes
5 answers
2k views

Smoothness of the closest point on a submanifold

17 votes
1 answer
634 views

An explicit reconstruction of a matrix from its minors

16 votes
1 answer
1k views

Is there an area-preserving diffeomorphism of the disk which is nowhere conformal?

16 votes
1 answer
1k views

How many values determine a norm?

15 votes
1 answer
1k views

Is $\delta(df \wedge df)=0$ an Euler-Lagrange equation?

14 votes
2 answers
881 views

Tweetable way to see Riemannian isometries are harmonic?

14 votes
2 answers
500 views

Do curvature differences obstruct a.e orientation-preserving isometries?

14 votes
3 answers
3k views

When a homeomorphism is a diffeomorphism w.r.t to a suitable smooth structure?

14 votes
2 answers
1k views

Obstructions for a group to be the multiplicative group of a field [duplicate]

14 votes
0 answers
627 views

Are harmonic mappings non-singular outside a set of measure zero?

14 votes
2 answers
857 views

Are all maps $\mathbb{R}^2 \to \mathbb{R}^2$ with fixed singular values affine?

13 votes
3 answers
938 views

A conformal map whose Jacobian vanishes at a point is constant?

13 votes
3 answers
2k views

Is there a global obstruction for a diffeomorphism to be an isometry?

13 votes
1 answer
710 views

Is this expression for the Laplacian of conformal maps between Riemannian manifolds known?

12 votes
1 answer
401 views

Is the image of the map $A \to \bigwedge^k A$ closed over $\mathbb{R}$?

12 votes
2 answers
924 views

which norms can be realized as operator norms?

12 votes
2 answers
730 views

A Converse to Cartan–Hadamard theorem?

12 votes
2 answers
648 views

Is the square root of a monotonic function whose all derivatives vanish smooth?

11 votes
2 answers
887 views

Are conformal maps between Riemannian manifolds real-analytic?

11 votes
1 answer
550 views

Is there a "formula" for the point in $\text{SO}(n)$ which is closest to a given matrix?

11 votes
1 answer
2k views

Does pullback in the category of smooth manifolds always exists?

11 votes
1 answer
704 views

Strong equivalence between intrinsic and extrinsic metrics on $GL_n^+$?

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