Question

How to test if a function is a metric (generally)

score 577 · Answer 1 · 2026-03-31 02:15:22

577

Views

How to test if a function is a metric (generally)

Published on 31 Mar 2026 - 2:15

score 36 · Answer 2 · 2018-04-12 15:04:09

36

Views

What does it mean for the differential of one function to be "independent"?

Published on 12 Apr 2018 - 15:04

score 176 · Answer 3 · 2026-03-22 18:53:17

176

Views

Continuous surjective map on a path connected subset of $\mathbb R^n$ which induces a covering map on a deformation retract space

Published on 22 Mar 2026 - 18:53

score 165 · Answer 4 · 2026-03-25 19:41:27

165

Views

Showing $\{ 0, 1 \}^{\mathbb{N}} $ is totally disconnected with given metric

Published on 25 Mar 2026 - 19:41

score 122 · Answer 5 · 2026-03-27 21:19:18

122

Views

Use cardinality to show the canonical embedding $c_0\rightarrow c_0^{**}$ is not surjective.

Published on 27 Mar 2026 - 21:19

score 98 · Answer 6 · 2018-04-12 17:53:12

98

Views

$f$ is a > continous function if and only if $G(f)$ is a closed subset of > $X\times Y$.

Published on 12 Apr 2018 - 17:53

score 58 · Answer 7 · 2018-04-12 18:36:40

58

Views

Homotopy classes $X\to \mathbb S^2$ determined by the projections

Published on 12 Apr 2018 - 18:36

score 120 · Answer 8 · 2026-03-31 02:15:22

120

Views

Metric with open singletons

Published on 31 Mar 2026 - 2:15

score 145 · Answer 9 · 2026-03-25 19:05:53

145

Views

why a particular map $f: \mathbb{S}^2 \times \mathbb{S}^1 \to SO(3)$ is not a homeomorphism?

Published on 25 Mar 2026 - 19:05

score 561 · Answer 10 · 2026-03-31 17:48:00

561

Views

Show $\mathbb{R}$ is not a union of countably many nowhere dense sets using nested interval theorem.

Published on 31 Mar 2026 - 17:48

score 234 · Answer 11 · 2026-03-29 14:45:54

234

Views

The topology induced by a "good" net convergence notion induces a net convergence notion as originally specified

Published on 29 Mar 2026 - 14:45

score 773 · Answer 12 · 2026-03-25 01:28:07

773

Views

Quotient topology R/Z homeomorphic to [0,1]/{0,1}

Published on 25 Mar 2026 - 1:28

score 291 · Answer 13 · 2026-03-26 16:56:43

291

Views

Suggestion of books of Topology and Graph Theory

Published on 26 Mar 2026 - 16:56

score 18 · Answer 14 · 2026-03-23 09:46:18

18

Views

Closed iff sums of distances of series converge in set

Published on 23 Mar 2026 - 9:46

score 100 · Answer 15 · 2018-04-13 08:21:55

100

Views

a surjective function is closed iff it maps Borel sets to Borel sets

Published on 13 Apr 2018 - 8:21

List Question

How to test if a function is a metric (generally)

What does it mean for the differential of one function to be "independent"?

Continuous surjective map on a path connected subset of $\mathbb R^n$ which induces a covering map on a deformation retract space

Showing $\{ 0, 1 \}^{\mathbb{N}} $ is totally disconnected with given metric

Use cardinality to show the canonical embedding $c_0\rightarrow c_0^{**}$ is not surjective.

$f$ is a > continous function if and only if $G(f)$ is a closed subset of > $X\times Y$.

Homotopy classes $X\to \mathbb S^2$ determined by the projections

Metric with open singletons

why a particular map $f: \mathbb{S}^2 \times \mathbb{S}^1 \to SO(3)$ is not a homeomorphism?

Show $\mathbb{R}$ is not a union of countably many nowhere dense sets using nested interval theorem.

The topology induced by a "good" net convergence notion induces a net convergence notion as originally specified

Quotient topology R/Z homeomorphic to [0,1]/{0,1}

Suggestion of books of Topology and Graph Theory

Closed iff sums of distances of series converge in set

a surjective function is closed iff it maps Borel sets to Borel sets

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