User Conifold

51 votes

4 answers

7k views

How undecidable is the spectral gap?

asked Dec 11, 2015 at 22:08

22 votes

2 answers

2k views

Is every elementary absolute geometry Euclidean or hyperbolic?

asked Sep 11, 2014 at 18:32

11 votes

1 answer

1k views

How to eliminate secular terms for perturbed non-oscillatory equations?

asked Jan 4, 2016 at 3:35

10 votes

0 answers

237 views

Rigorous results on chaos in a driven damped pendulum

asked Aug 13, 2020 at 21:20

9 votes

1 answer

564 views

Peter–Weyl decomposition of a group representation rather than group algebra

asked Jun 18 at 14:30

9 votes

1 answer

2k views

Lower bound on the irrationality measure of $\pi$

asked Aug 18, 2014 at 19:31

9 votes

1 answer

725 views

Is there a straightedge and compass construction of incommensurables in the hyperbolic plane?

asked Sep 2, 2014 at 18:59

8 votes

0 answers

195 views

Is there a universal straightedge and compass construction of a segment incommensurable to a given one in the hyperbolic plane?

asked Mar 26, 2015 at 20:02

7 votes

0 answers

453 views

Geometric bang-bang theorem for nonlinear optimal control

asked Feb 12, 2019 at 16:49

5 votes

1 answer

500 views

What axioms (other than choice) have a taming effect on the ordering of cardinalities?

asked Jun 20, 2014 at 20:49

3 votes

0 answers

161 views

Real root of the derivative of a prime cyclotomic polynomial

asked Feb 19, 2020 at 19:27

2 votes

2 answers

1k views

Continuous linear functionals in strong operator and $\sigma$-strong topologies

asked Jun 1, 2014 at 19:43

2 votes

1 answer

970 views

Positive definite quadratic forms on Banach spaces

asked Jul 28, 2014 at 18:44

2 votes

0 answers

93 views

What are "minimal lines" in complex geometry?

asked May 23, 2015 at 19:50

1 vote

1 answer

276 views

What is the expected number of missing random integers?

asked Jan 23, 2018 at 19:02

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15 Questions

How undecidable is the spectral gap?

Is every elementary absolute geometry Euclidean or hyperbolic?

How to eliminate secular terms for perturbed non-oscillatory equations?

Rigorous results on chaos in a driven damped pendulum

Peter–Weyl decomposition of a group representation rather than group algebra

Lower bound on the irrationality measure of $\pi$

Is there a straightedge and compass construction of incommensurables in the hyperbolic plane?

Is there a universal straightedge and compass construction of a segment incommensurable to a given one in the hyperbolic plane?

Geometric bang-bang theorem for nonlinear optimal control

What axioms (other than choice) have a taming effect on the ordering of cardinalities?

Real root of the derivative of a prime cyclotomic polynomial

Continuous linear functionals in strong operator and $\sigma$-strong topologies

Positive definite quadratic forms on Banach spaces

What are "minimal lines" in complex geometry?

What is the expected number of missing random integers?