Question

Looking for reference on cup and cap product without invoking acyclic model theorem

score 192 · Answer 1 · 2026-04-14 09:50:06

192

Views

Looking for reference on cup and cap product without invoking acyclic model theorem

Published on 14 Apr 2026 - 9:50

score 293 · Answer 2 · 2026-04-16 06:55:02

293

Views

Perpendicular bisector in a different metric

Published on 16 Apr 2026 - 6:55

score 185 · Answer 3 · 2026-04-14 16:16:57

185

Views

Condition on when two different metrics generate the same topology

Published on 14 Apr 2026 - 16:16

score 106 · Answer 4 · 2026-04-15 10:41:37

106

Views

Regular open sets in topology generated by regular open sets

Published on 15 Apr 2026 - 10:41

score 52 · Answer 5 · 2026-04-12 10:59:59

52

Views

Compact Hausdorf space $\implies$ not the countable union of nowhere dense sets?

Published on 12 Apr 2026 - 10:59

score 159 · Answer 6 · 2026-04-12 06:29:10

159

Views

Defining a non-Hausdorff space

Published on 12 Apr 2026 - 6:29

score 308 · Answer 7 · 2026-04-12 06:15:32

308

Views

Locally compact hausdorff space homeomorphism

Published on 12 Apr 2026 - 6:15

score 231 · Answer 8 · 2026-04-29 03:32:16

231

Views

The closed sphere $B_1(0)$ in $(C (X), d_\infty)$ is compact iff $X$ is finite

Published on 29 Apr 2026 - 3:32

score 1.6k · Answer 9 · 2026-04-11 20:29:23

1.6k

Views

Proving $\mathbb{N}$ is not compact

Published on 11 Apr 2026 - 20:29

score 52 · Answer 10 · 2026-04-15 07:35:49

52

Views

In the topology,Let $X=\{1,2,3\}$ and let $d:X \times X \to[0,+ ∞)$ be a function defined by formulas

Published on 15 Apr 2026 - 7:35

score 753 · Answer 11 · 2026-04-15 10:46:08

753

Views

A space obtained by $S^3$ by removing a Hopf link

Published on 15 Apr 2026 - 10:46

score 428 · Answer 12 · 2026-04-09 02:44:24

428

Views

Is it true that every perfect set of a compact Hausdorff space is uncountable?

Published on 09 Apr 2026 - 2:44

score 28 · Answer 13 · 2026-04-11 16:15:41

28

Views

Is $T_1$ condition necessary in the definition of completely normality?

Published on 11 Apr 2026 - 16:15

score 918 · Answer 14 · 2026-04-16 04:45:43

918

Views

Is $\left<a,b,c|aba^{-1}b^{-1},aca^{-1}c^{-1}\right>$ the fundamental group of two tori joined by a circle?

Published on 16 Apr 2026 - 4:45

score 647 · Answer 15 · 2026-04-15 04:57:08

647

Views

Question about the one point compactification $\mathbb{R}^2 \cup \infty$ of $S^2$

Published on 15 Apr 2026 - 4:57

List Question

Looking for reference on cup and cap product without invoking acyclic model theorem

Perpendicular bisector in a different metric

Condition on when two different metrics generate the same topology

Regular open sets in topology generated by regular open sets

Compact Hausdorf space $\implies$ not the countable union of nowhere dense sets?

Defining a non-Hausdorff space

Locally compact hausdorff space homeomorphism

The closed sphere $B_1(0)$ in $(C (X), d_\infty)$ is compact iff $X$ is finite

Proving $\mathbb{N}$ is not compact

In the topology,Let $X=\{1,2,3\}$ and let $d:X \times X \to[0,+ ∞)$ be a function defined by formulas

A space obtained by $S^3$ by removing a Hopf link

Is it true that every perfect set of a compact Hausdorff space is uncountable?

Is $T_1$ condition necessary in the definition of completely normality?

Is $\left<a,b,c|aba^{-1}b^{-1},aca^{-1}c^{-1}\right>$ the fundamental group of two tori joined by a circle?

Question about the one point compactification $\mathbb{R}^2 \cup \infty$ of $S^2$

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