User Ali Taghavi

71 votes

24 answers

19k views

PhD dissertations that solve an established open problem

asked Apr 24, 2018 at 7:19

38 votes

3 answers

8k views

The error in Petrovski and Landis' proof of the 16th Hilbert problem

asked Jun 17, 2014 at 2:05

29 votes

1 answer

3k views

Is there an explicit formula for the hessian of "Determinant"?

asked Sep 6, 2016 at 22:31

28 votes

2 answers

2k views

Codimension of the range of certain linear operators

asked Apr 22, 2014 at 20:59

27 votes

0 answers

1k views

Unital $C^{*}$ algebras whose all elements have path connected spectrum

asked Feb 7, 2015 at 0:24

24 votes

2 answers

2k views

Periodic orbit property

asked Dec 24, 2013 at 13:21

23 votes

1 answer

1k views

Eigenvalues of Laplace operator

asked Dec 10, 2017 at 0:24

21 votes

3 answers

2k views

Manifolds with polynomial transition maps

asked Jul 17, 2017 at 7:03

20 votes

1 answer

1k views

Derivation on real analytic manifolds

asked Feb 26, 2014 at 17:29

19 votes

3 answers

1k views

What standard Banach space is isomorphic to the completion of this different normed structure on $\ell^1$?

asked Mar 30, 2023 at 9:08

18 votes

3 answers

2k views

Can the Laplace operator on $n-$ manifolds be represented as a sum of $n$ second order derivational operators

asked Aug 5, 2015 at 3:56

17 votes

2 answers

2k views

The letters of the word "ART"

asked Dec 19, 2014 at 14:02

17 votes

2 answers

1k views

Are there some intrinsic invariants of surfaces other than Gaussian curvature?

asked Jun 3, 2016 at 11:35

17 votes

1 answer

986 views

Uncountably many subsets of the natural numbers with certain natural density condition

asked Jul 17, 2022 at 12:17

16 votes

2 answers

2k views

An analogue of the exponential function by replacing infinite series with improper integral

asked Jan 29, 2020 at 12:01

15 votes

0 answers

716 views

Is this "Homology" useful to study?

asked Jan 1, 2017 at 14:23

15 votes

1 answer

524 views

Non standard extension of real numbers via nonprincipal ultra filters

asked Apr 11, 2017 at 9:15

15 votes

1 answer

784 views

The completion of the space of finite groups

asked Apr 17, 2017 at 14:45

15 votes

1 answer

595 views

An equivariant map from sphere to a Lie group of lower dimension which is not null homotopic?

asked May 2, 2018 at 5:27

14 votes

1 answer

459 views

A parametric version of the Borsuk Ulam theorem

asked Jan 4, 2019 at 17:40

14 votes

2 answers

5k views

A certain mathematical competition in the UK

asked Jun 19, 2016 at 16:08

14 votes

1 answer

2k views

The perturbation of non-Hamiltonian algebraic vector fields

asked Feb 18, 2014 at 20:10

13 votes

5 answers

3k views

A geometric proof of the Gauss-Lucas theorem

asked Jun 19, 2016 at 10:33

13 votes

0 answers

802 views

Hilbert 16th problem and dynamical Lefschetz trace formula

asked Jun 6, 2019 at 20:27

12 votes

1 answer

778 views

Is a Lebesgue measurable subgroup of $\mathbb{R}$ a Borel measurable set?

asked Aug 29, 2016 at 6:54

12 votes

2 answers

555 views

Restriction of "$\pi_{1}$" to topological groups

asked Feb 24, 2014 at 13:07

12 votes

3 answers

2k views

Limit cycles as closed geodesics (in negatively or positively curved space)

asked Mar 20, 2014 at 16:35

12 votes

1 answer

745 views

"The" kronecker foliation or "a" kronecker foliation?

asked Aug 8, 2014 at 5:25

12 votes

2 answers

520 views

Homeo-Fixed point property

asked Oct 7, 2014 at 9:07

12 votes

3 answers

860 views

A nontrivial principal bundle which satisfies Leray-Hirsch theorem

asked Jul 7, 2020 at 15:20

Stack Exchange Network

755 Questions

PhD dissertations that solve an established open problem

The error in Petrovski and Landis' proof of the 16th Hilbert problem

Is there an explicit formula for the hessian of "Determinant"?

Codimension of the range of certain linear operators

Unital $C^{*}$ algebras whose all elements have path connected spectrum

Periodic orbit property

Eigenvalues of Laplace operator

Manifolds with polynomial transition maps

Derivation on real analytic manifolds

What standard Banach space is isomorphic to the completion of this different normed structure on $\ell^1$?

Can the Laplace operator on $n-$ manifolds be represented as a sum of $n$ second order derivational operators

The letters of the word "ART"

Are there some intrinsic invariants of surfaces other than Gaussian curvature?

Uncountably many subsets of the natural numbers with certain natural density condition

An analogue of the exponential function by replacing infinite series with improper integral

Is this "Homology" useful to study?

Non standard extension of real numbers via nonprincipal ultra filters

The completion of the space of finite groups

An equivariant map from sphere to a Lie group of lower dimension which is not null homotopic?

A parametric version of the Borsuk Ulam theorem

A certain mathematical competition in the UK

The perturbation of non-Hamiltonian algebraic vector fields

A geometric proof of the Gauss-Lucas theorem

Hilbert 16th problem and dynamical Lefschetz trace formula

Is a Lebesgue measurable subgroup of $\mathbb{R}$ a Borel measurable set?

Restriction of "$\pi_{1}$" to topological groups

Limit cycles as closed geodesics (in negatively or positively curved space)

"The" kronecker foliation or "a" kronecker foliation?

Homeo-Fixed point property

A nontrivial principal bundle which satisfies Leray-Hirsch theorem