Question

Is the difference of two functions weakly lower semicontinuous a function w.l.s.c?

score 44 · Answer 1 · 2026-04-13 17:26:28

44

Views

Is the difference of two functions weakly lower semicontinuous a function w.l.s.c?

Published on 13 Apr 2026 - 17:26

score 234 · Answer 2 · 2026-05-11 09:48:04

234

Views

In what sense are Minkowski spaces with $(1,3)$ and $(3,1)$ signature isomorphic?

Published on 11 May 2026 - 9:48

score 58 · Answer 3 · 2026-05-04 21:01:49

58

Views

An exercise on the quotient mapping $f:\mathbb{R}\to\mathbb{Z}$

Published on 04 May 2026 - 21:01

score 46 · Answer 4 · 2026-04-12 13:14:12

46

Views

In topological spaces are there at least two equivalent ways to define the closure of a set?

Published on 12 Apr 2026 - 13:14

score 1.2k · Answer 5 · 2026-04-16 17:09:52

1.2k

Views

Proof: Every closed set of real numbers is an $F_\sigma$ set

Published on 16 Apr 2026 - 17:09

score 1k · Answer 6 · 2026-05-11 02:52:26

1k

Views

Intuition for the Stone-Čech compactification via ultrafilters

Published on 11 May 2026 - 2:52

score 341 · Answer 7 · 2026-05-10 17:13:32

341

Views

Product of a compact set and a singleton is compact proof

Published on 10 May 2026 - 17:13

score 146 · Answer 8 · 2026-04-11 05:53:26

146

Views

Continuous maps between compact Hausdorff spaces and their induced maps on their space of continuous real-valued functions.

Published on 11 Apr 2026 - 5:53

score 235 · Answer 9 · 2026-04-14 11:19:48

235

Views

What type of functions map a simply connected set onto a simply connected set

Published on 14 Apr 2026 - 11:19

score 731 · Answer 10 · 2026-05-15 01:52:02

731

Views

Hartshorne II-3.22(b)

Published on 15 May 2026 - 1:52

score 1k · Answer 11 · 2026-04-16 08:29:37

1k

Views

If the image of the interior equals the interior of the image, the map is continuous

Published on 16 Apr 2026 - 8:29

score 447 · Answer 12 · 2026-04-12 01:48:33

447

Views

Examples of connected door spaces.

Published on 12 Apr 2026 - 1:48

score 168 · Answer 13 · 2026-05-10 19:38:50

168

Views

Product of a compact topological space and a singleton in another topological space is compact proof

Published on 10 May 2026 - 19:38

score 150 · Answer 14 · 2026-04-12 12:00:59

150

Views

Can a simple closed curve in a compact surface be dense?

Published on 12 Apr 2026 - 12:00

score 64 · Answer 15 · 2026-05-15 04:05:06

64

Views

Left Semigroups and Compact sets

Published on 15 May 2026 - 4:05

List Question

Is the difference of two functions weakly lower semicontinuous a function w.l.s.c?

In what sense are Minkowski spaces with $(1,3)$ and $(3,1)$ signature isomorphic?

An exercise on the quotient mapping $f:\mathbb{R}\to\mathbb{Z}$

In topological spaces are there at least two equivalent ways to define the closure of a set?

Proof: Every closed set of real numbers is an $F_\sigma$ set

Intuition for the Stone-Čech compactification via ultrafilters

Product of a compact set and a singleton is compact proof

Continuous maps between compact Hausdorff spaces and their induced maps on their space of continuous real-valued functions.

What type of functions map a simply connected set onto a simply connected set

Hartshorne II-3.22(b)

If the image of the interior equals the interior of the image, the map is continuous

Examples of connected door spaces.

Product of a compact topological space and a singleton in another topological space is compact proof

Can a simple closed curve in a compact surface be dense?

Left Semigroups and Compact sets

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