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Geometric Intuition of regular open sets

score 728 · Answer 1 · 2026-04-13 18:34:10

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Geometric Intuition of regular open sets

Published on 13 Apr 2026 - 18:34

score 59 · Answer 2 · 2026-04-13 05:16:11

59

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Is the phrase "closed under intersections" correct here?

Published on 13 Apr 2026 - 5:16

score 326 · Answer 3 · 2026-04-14 16:45:12

326

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Equivalence of isolated point in metric space and singleton open set in topological space

Published on 14 Apr 2026 - 16:45

score 91 · Answer 4 · 2026-04-15 21:14:02

91

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Using the definition of convergence , show that $a_n=\sqrt{n+1}- \sqrt{n}$ Converges to $0$.

Published on 15 Apr 2026 - 21:14

score 73 · Answer 5 · 2026-04-14 04:10:19

73

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motivation and geometric intuition of considering the metric $\hat{d}$ when showing open subset of Polish is Polish

Published on 14 Apr 2026 - 4:10

score 181 · Answer 6 · 2026-05-11 05:16:35

181

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Can a countable model of arithmetic have mutually non-definable numbers?

Published on 11 May 2026 - 5:16

score 49 · Answer 7 · 2026-04-11 08:29:52

49

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Question on the plane curve definition

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score 154 · Answer 8 · 2026-04-09 14:27:51

154

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Published on 09 Apr 2026 - 14:27

score 835 · Answer 9 · 2026-04-17 09:57:26

835

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Seminorm is continuous regarding $\|\cdot\|$,

Published on 17 Apr 2026 - 9:57

score 4.9k · Answer 10 · 2026-04-11 17:44:18

4.9k

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Question about distributive law in definition of a ring

Published on 11 Apr 2026 - 17:44

score 211 · Answer 11 · 2026-04-07 23:52:59

211

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Clarification on a definition of limsup

Published on 07 Apr 2026 - 23:52

score 348 · Answer 12 · 2026-04-14 07:30:03

348

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Numberphile: Vi Hart's favourite number, $*$. What is it?

Published on 14 Apr 2026 - 7:30

score 111 · Answer 13 · 2026-04-15 07:04:22

111

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Where would $\leftarrow$ fit in Wikipedia's list of maths symbols?

Published on 15 Apr 2026 - 7:04

score 36 · Answer 14 · 2026-04-15 09:57:31

36

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Name of special chain matrix product

Published on 15 Apr 2026 - 9:57

score 6.2k · Answer 15 · 2026-04-10 04:10:45

6.2k

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How to show that a given function is a polynomial?

Published on 10 Apr 2026 - 4:10

List Question

Geometric Intuition of regular open sets

Is the phrase "closed under intersections" correct here?

Equivalence of isolated point in metric space and singleton open set in topological space

Using the definition of convergence , show that $a_n=\sqrt{n+1}- \sqrt{n}$ Converges to $0$.

motivation and geometric intuition of considering the metric $\hat{d}$ when showing open subset of Polish is Polish

Can a countable model of arithmetic have mutually non-definable numbers?

Question on the plane curve definition

Question about the difference between topological spaces and topologies

Seminorm is continuous regarding $\|\cdot\|$,

Question about distributive law in definition of a ring

Clarification on a definition of limsup

Numberphile: Vi Hart's favourite number, $*$. What is it?

Where would $\leftarrow$ fit in Wikipedia's list of maths symbols?

Name of special chain matrix product

How to show that a given function is a polynomial?

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