Question

Is the set of real matrices diagonalizable in $M_n(\mathbb C)$ dense in the set of block like companion matrices?

score 267 · Answer 1 · 2026-04-03 00:01:32

267

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Is the set of real matrices diagonalizable in $M_n(\mathbb C)$ dense in the set of block like companion matrices?

Published on 03 Apr 2026 - 0:01

score 48 · Answer 2 · 2026-03-28 20:09:33

48

Views

If $\overline{U \cap Z}$ is compact in $\bar U$, how does it follow that $\overline{U \cap Z}$ is compact in $Z$?

Published on 28 Mar 2026 - 20:09

score 193 · Answer 3 · 2026-04-08 23:10:58

193

Views

Spaces That Have Uncountably Many Disjoint Copies in $\mathbb{R}^2$

Published on 08 Apr 2026 - 23:10

score 331 · Answer 4 · 2018-07-06 03:45:47

331

Views

$X$ Hausdorff and Compact, $f: X \rightarrow X$ continuous. Is the set of fixed points of $f$ Compact?

Published on 06 Jul 2018 - 3:45

score 2k · Answer 5 · 2018-07-06 04:51:03

2k

Views

Points of a dense set are not limit points

Published on 06 Jul 2018 - 4:51

score 143 · Answer 6 · 2026-04-09 02:49:53

143

Views

Showing that a net is universal

Published on 09 Apr 2026 - 2:49

score 230 · Answer 7 · 2018-07-06 14:01:58

230

Views

Does a limit point always exist?

Published on 06 Jul 2018 - 14:01

score 106 · Answer 8 · 2026-03-29 16:33:34

106

Views

Euclidean norm and spheres

Published on 29 Mar 2026 - 16:33

score 61 · Answer 9 · 2026-04-08 07:26:16

61

Views

Parameterizing an $m$-covered sphere

Published on 08 Apr 2026 - 7:26

score 546 · Answer 10 · 2018-07-06 17:51:57

546

Views

Is union of regular open sets a regular open set provided the intersection of the two sets is nonempty?

Published on 06 Jul 2018 - 17:51

score 184 · Answer 11 · 2018-07-06 18:09:57

184

Views

Questions on the one point compactification on $\mathbb{R}^2$

Published on 06 Jul 2018 - 18:09

score 149 · Answer 12 · 2026-03-31 22:51:41

149

Views

What are some applications of graph theory to topology?

Published on 31 Mar 2026 - 22:51

score 369 · Answer 13 · 2026-03-25 12:54:39

369

Views

Hausdorff covering space of a quotient

Published on 25 Mar 2026 - 12:54

score 157 · Answer 14 · 2018-07-07 10:16:14

157

Views

Topology: Show that $\partial A=\emptyset$

Published on 07 Jul 2018 - 10:16

score 300 · Answer 15 · 2026-03-26 09:40:13

300

Views

Uniqueness of the initial topology

Published on 26 Mar 2026 - 9:40

List Question

Is the set of real matrices diagonalizable in $M_n(\mathbb C)$ dense in the set of block like companion matrices?

If $\overline{U \cap Z}$ is compact in $\bar U$, how does it follow that $\overline{U \cap Z}$ is compact in $Z$?

Spaces That Have Uncountably Many Disjoint Copies in $\mathbb{R}^2$

$X$ Hausdorff and Compact, $f: X \rightarrow X$ continuous. Is the set of fixed points of $f$ Compact?

Points of a dense set are not limit points

Showing that a net is universal

Does a limit point always exist?

Euclidean norm and spheres

Parameterizing an $m$-covered sphere

Is union of regular open sets a regular open set provided the intersection of the two sets is nonempty?

Questions on the one point compactification on $\mathbb{R}^2$

What are some applications of graph theory to topology?

Hausdorff covering space of a quotient

Topology: Show that $\partial A=\emptyset$

Uniqueness of the initial topology

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