Question

Every subspace of a Frechet-Urysohn space is a Frechet- Urysohn space and hence also a sequential space

score 122 · Answer 1 · 2018-03-30 19:58:09

122

Views

Every subspace of a Frechet-Urysohn space is a Frechet- Urysohn space and hence also a sequential space

Published on 30 Mar 2018 - 19:58

score 54 · Answer 2 · 2018-03-30 22:22:21

54

Views

Needing help with a proof in topology of sets

Published on 30 Mar 2018 - 22:22

score 47 · Answer 3 · 2018-03-31 01:12:43

47

Views

$\overline{C} = \overline{int(C)}$, C closed, in normed space

Published on 31 Mar 2018 - 1:12

score 88 · Answer 4 · 2018-03-31 03:40:40

88

Views

Help with problem of basis of topology

Published on 31 Mar 2018 - 3:40

score 237 · Answer 5 · 2026-03-30 15:53:50

237

Views

Is "$S$ = {$x ∈ l_2$ | $x = (x_n)$, $x_n = 0$ for inﬁnitely many $n$} in $l_2$ " Nowhere Dense?

Published on 30 Mar 2026 - 15:53

score 680 · Answer 6 · 2026-03-25 13:50:27

680

Views

quotient topology doesn't preserve separation axioms

Published on 25 Mar 2026 - 13:50

score 722 · Answer 7 · 2026-03-28 06:41:51

722

Views

$U$ be the set of all $2×2$ matrices with real entries such that all their eigenvalues belong to $C - R $, and $X = M_2(R)$. Is $U$ open?

Published on 28 Mar 2026 - 6:41

score 192 · Answer 8 · 2018-03-31 07:06:28

192

Views

I would like to understand Baire theorem

Published on 31 Mar 2018 - 7:06

score 343 · Answer 9 · 2018-03-31 08:22:28

343

Views

Understanding the closure of the following subset of the ordered square

Published on 31 Mar 2018 - 8:22

score 72 · Answer 10 · 2026-03-25 18:14:14

72

Views

Weak* topology and connectedness

Published on 25 Mar 2026 - 18:14

score 351 · Answer 11 · 2018-03-31 10:49:20

351

Views

closures of the following subsets of the ordered square ?1

Published on 31 Mar 2018 - 10:49

score 267 · Answer 12 · 2026-03-25 00:01:12

267

Views

Pushout in category of Stone spaces

Published on 25 Mar 2026 - 0:01

score 363 · Answer 13 · 2018-03-31 13:58:08

363

Views

Does the following sequence converge in product, uniform and box topologies?

Published on 31 Mar 2018 - 13:58

score 190 · Answer 14 · 2018-03-31 17:21:27

190

Views

Topology: If $G\subset E, G$ is open and $E$ satisfies $\overline{E^0}\subset G$. Prove $G$ is closed too.

Published on 31 Mar 2018 - 17:21

score 975 · Answer 15 · 2026-03-20 12:49:15

975

Views

Is $[0,1]$ the Stone-Čech compactification of $(0,1)$?

Published on 20 Mar 2026 - 12:49

List Question

Every subspace of a Frechet-Urysohn space is a Frechet- Urysohn space and hence also a sequential space

Needing help with a proof in topology of sets

$\overline{C} = \overline{int(C)}$, C closed, in normed space

Help with problem of basis of topology

Is "$S$ = {$x ∈ l_2$ | $x = (x_n)$, $x_n = 0$ for inﬁnitely many $n$} in $l_2$ " Nowhere Dense?

quotient topology doesn't preserve separation axioms

$U$ be the set of all $2×2$ matrices with real entries such that all their eigenvalues belong to $C - R $, and $X = M_2(R)$. Is $U$ open?

I would like to understand Baire theorem

Understanding the closure of the following subset of the ordered square

Weak* topology and connectedness

closures of the following subsets of the ordered square ?1

Pushout in category of Stone spaces

Does the following sequence converge in product, uniform and box topologies?

Topology: If $G\subset E, G$ is open and $E$ satisfies $\overline{E^0}\subset G$. Prove $G$ is closed too.

Is $[0,1]$ the Stone-Čech compactification of $(0,1)$?

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