User erz

37 votes

Examples where existence is harder than evaluation

answered May 8, 2019 at 2:21

8 votes

Connectedness in the plane

answered May 8, 2017 at 1:50

6 votes

Accepted

Supremum over which sets makes $H^{\infty}$ non-separable?

answered Jul 28, 2020 at 8:28

5 votes

Point-wise limit of finite valued functions

answered May 4, 2018 at 21:11

4 votes

Is there a dense subset on closed Jordan curve $C$ which its points make intersections under certain rotations?

answered May 13, 2018 at 1:19

4 votes

Accepted

points separation and dimensions

answered May 25, 2017 at 2:40

4 votes

If all points of a real function with positive values would be local minimum, can one say it is constant function?

answered Aug 6, 2020 at 6:04

4 votes

A question about connected subsets of $[0,1]^2$

answered May 22, 2021 at 19:07

4 votes

Can a connected planar compactum minus a point be totally disconnected?

answered Apr 14, 2020 at 11:53

3 votes

Accepted

Whether $\varphi(E)$ is a Jordan measurable set?

answered Feb 19, 2017 at 6:15

3 votes

Accepted

Hausdorff convergence of preimages of discrete-valued functions

answered Dec 16, 2017 at 21:14

2 votes

Bounded-open topology vs norm on $L\left(X,Y\right)$

answered Mar 28, 2015 at 22:41

2 votes

Accepted

Generating the topology of a manifold

answered Jul 12, 2017 at 13:47

2 votes

Accepted

Hausdorff quotient space with compact or finite inverse images

answered May 31, 2018 at 23:18

2 votes

Accepted

Weak basis of normed linear space

answered Apr 15, 2021 at 21:45

2 votes

Accepted

Inequalities for upper semi-continuous affine functions on compact sets by using extreme points

answered Feb 11, 2020 at 14:58

2 votes

Accepted

Integrable functions as elements of closed absolutely convex hulls of precompact sets of indicator functions

answered May 1, 2020 at 21:44

2 votes

Accepted

Quotient distance on $\mathbb{C}P^n$ is equivalent to distance induced by the Fubini-Study metric

answered May 22, 2020 at 12:17

2 votes

Accepted

Null preserving transformation

answered May 31, 2020 at 14:44

1 vote

Is it possible to connect every compact set?

answered May 6, 2020 at 4:29

1 vote

Accepted

Density of continuous functions to interior in set of all continuous functions

answered Mar 7, 2020 at 6:24

1 vote

Injectivity of a locally strictly expanding map on a compact space

answered Apr 30, 2020 at 5:25

1 vote

Accepted

Biorthogonal weakly null basic sequences

answered May 24, 2021 at 22:56

1 vote

Accepted

Existence of topologically transitive map on Euclidean space

answered Jun 14, 2020 at 4:42

1 vote

characterization of the unit disk

answered Oct 28, 2019 at 1:36

1 vote

Parallelepiped is defined by the volumes of its faces

answered May 15, 2018 at 18:43

1 vote

Accepted

$S_M$ is not always homeomorphic to the 1-sphere of $F$

answered May 20, 2018 at 22:38

1 vote

Topologies of pairs and closed bounded convex sets

answered Sep 1, 2017 at 14:32

1 vote

Space of curves

answered Feb 15, 2017 at 0:24

1 vote

Convexity of distance-to-boundary function

answered Jan 29, 2018 at 12:18

Stack Exchange Network

35 Answers

Examples where existence is harder than evaluation

Connectedness in the plane

Supremum over which sets makes $H^{\infty}$ non-separable?

Point-wise limit of finite valued functions

Is there a dense subset on closed Jordan curve $C$ which its points make intersections under certain rotations?

points separation and dimensions

If all points of a real function with positive values would be local minimum, can one say it is constant function?

A question about connected subsets of $[0,1]^2$

Can a connected planar compactum minus a point be totally disconnected?

Whether $\varphi(E)$ is a Jordan measurable set?

Hausdorff convergence of preimages of discrete-valued functions

Bounded-open topology vs norm on $L\left(X,Y\right)$

Generating the topology of a manifold

Hausdorff quotient space with compact or finite inverse images

Weak basis of normed linear space

Inequalities for upper semi-continuous affine functions on compact sets by using extreme points

Integrable functions as elements of closed absolutely convex hulls of precompact sets of indicator functions

Quotient distance on $\mathbb{C}P^n$ is equivalent to distance induced by the Fubini-Study metric

Null preserving transformation

Is it possible to connect every compact set?

Density of continuous functions to interior in set of all continuous functions

Injectivity of a locally strictly expanding map on a compact space

Biorthogonal weakly null basic sequences

Existence of topologically transitive map on Euclidean space

characterization of the unit disk

Parallelepiped is defined by the volumes of its faces

$S_M$ is not always homeomorphic to the 1-sphere of $F$

Topologies of pairs and closed bounded convex sets

Space of curves

Convexity of distance-to-boundary function