User Mikhail Katz

5 votes

Accepted

Non standard extension of real numbers via nonprincipal ultra filters

answered Apr 20, 2017 at 12:49

5 votes

How do we know that Fermat wrote his famous note in 1637?

answered Sep 3, 2017 at 15:57

5 votes

Accepted

Bishop-Gromov type inequality for Jordan curve on 2-sphere

answered Jul 3, 2017 at 8:37

5 votes

Has philosophy ever clarified mathematics?

answered Oct 15, 2017 at 15:05

5 votes

What's wrong with the surreals?

answered Feb 21, 2016 at 16:00

5 votes

Height function on 2-torus with only 3 critical points

answered Feb 3, 2016 at 7:50

5 votes

Missing citations of "to appear" papers on MathSciNet

answered Apr 6, 2016 at 15:31

5 votes

Is non-existence of the hyperreals consistent with ZF?

answered Dec 4, 2014 at 16:33

5 votes

Historical quotation search: Equations/formulae in (Latin?) prose, before modern symbolic notation

answered Feb 27, 2014 at 15:35

5 votes

Taking "Zooming in on a point of a graph" seriously

answered Feb 28, 2014 at 11:21

5 votes

In the $\mathbb{H}^3$ upper half space model, is a hemiellipsoid perpendicular to the plane at infinity a minimal surface?

answered Dec 19, 2015 at 17:43

4 votes

How to prove Liouville measure is invariant under geodesic flow?

answered Dec 8, 2015 at 13:12

4 votes

What is... a grossone?

answered Dec 31, 2015 at 8:20

4 votes

A Converse to Cartan–Hadamard theorem?

answered Jan 11, 2016 at 13:48

4 votes

Accepted

The center of a minimal convex superbody

answered Jan 11, 2016 at 15:08

4 votes

Transitive geodesics on closed surfaces of genus greater than one

answered Aug 6, 2013 at 14:13

4 votes

How close can closed geodesics be?

answered Aug 19, 2013 at 16:49

4 votes

Isoperimetric inequality on a Riemannian sphere

answered Sep 11, 2013 at 13:40

4 votes

Why there are two point at infinity on certain elliptic curve

answered Dec 4, 2014 at 17:45

4 votes

Accepted

Curvature of contour lines of a scalar field

answered Apr 21, 2013 at 13:55

4 votes

A remark of Connes on non-standard analysis

answered Nov 20, 2012 at 16:28

4 votes

Are all countable, nonstandard models of arithmetic given by ultrapowers?

answered Mar 11, 2013 at 17:15

4 votes

Accepted

How isometric action on Riemannian manifold acts on cut locus

answered Apr 17, 2016 at 10:59

4 votes

What is the Status of Borel conjecture today?

answered Jan 17, 2016 at 13:17

4 votes

Has philosophy ever clarified mathematics?

answered Jun 16, 2016 at 14:53

4 votes

Normal variation of embedded surfaces

answered Jun 3, 2016 at 8:11

4 votes

Accepted

Fundamental group of Alexandrov space.

answered May 9, 2018 at 10:08

4 votes

The most outrageous (or ridiculous) conjectures in mathematics

answered Mar 13, 2017 at 10:19

4 votes

Why are two "random" vectors in $\mathbb R^n$ approximately orthogonal for large $n$?

answered Aug 29, 2016 at 9:05

4 votes

How many non-orthogonal vectors fit into a complex vector space?

answered Nov 15, 2023 at 14:33

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184 Answers

Non standard extension of real numbers via nonprincipal ultra filters

How do we know that Fermat wrote his famous note in 1637?

Bishop-Gromov type inequality for Jordan curve on 2-sphere

Has philosophy ever clarified mathematics?

What's wrong with the surreals?

Height function on 2-torus with only 3 critical points

Missing citations of "to appear" papers on MathSciNet

Is non-existence of the hyperreals consistent with ZF?

Historical quotation search: Equations/formulae in (Latin?) prose, before modern symbolic notation

Taking "Zooming in on a point of a graph" seriously

In the $\mathbb{H}^3$ upper half space model, is a hemiellipsoid perpendicular to the plane at infinity a minimal surface?

How to prove Liouville measure is invariant under geodesic flow?

What is... a grossone?

A Converse to Cartan–Hadamard theorem?

The center of a minimal convex superbody

Transitive geodesics on closed surfaces of genus greater than one

How close can closed geodesics be?

Isoperimetric inequality on a Riemannian sphere

Why there are two point at infinity on certain elliptic curve

Curvature of contour lines of a scalar field

A remark of Connes on non-standard analysis

Are all countable, nonstandard models of arithmetic given by ultrapowers?

How isometric action on Riemannian manifold acts on cut locus

What is the Status of Borel conjecture today?

Has philosophy ever clarified mathematics?

Normal variation of embedded surfaces

Fundamental group of Alexandrov space.

The most outrageous (or ridiculous) conjectures in mathematics

Why are two "random" vectors in $\mathbb R^n$ approximately orthogonal for large $n$?

How many non-orthogonal vectors fit into a complex vector space?