Question

What is the intuition behind $\Delta_1^0$ sets and $\Delta_1^1$ sets?

score 351 · Answer 1 · 2026-03-26 11:17:26

351

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What is the intuition behind $\Delta_1^0$ sets and $\Delta_1^1$ sets?

Published on 26 Mar 2026 - 11:17

score 446 · Answer 2 · 2026-04-12 15:33:03

446

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How can you describe topology to a non-mathematician without using continuous deformations?

Published on 12 Apr 2026 - 15:33

score 231 · Answer 3 · 2026-04-06 00:46:35

231

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Countably or Uncountably Many Discontinuities

Published on 06 Apr 2026 - 0:46

score 535 · Answer 4 · 2026-04-13 14:11:00

535

Views

Why is the derivative a limit?

Published on 13 Apr 2026 - 14:11

score 2.7k · Answer 5 · 2026-04-12 04:47:15

2.7k

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When can I successfully move differentiation from inside a summation to outside?

Published on 12 Apr 2026 - 4:47

score 71 · Answer 6 · 2026-04-13 15:25:53

71

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Cross Product Component Values

Published on 13 Apr 2026 - 15:25

score 1k · Answer 7 · 2026-03-28 09:42:24

1k

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A subgroup has the same number of left and right cosets - Tricks - Fraleigh p. 103 10.32, 35

Published on 28 Mar 2026 - 9:42

score 212 · Answer 8 · 2014-01-22 16:21:29

212

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Intuition and Strategy - Index of Subgroup of Subgroup Proof - Fraleigh p. 103 10.38

Published on 22 Jan 2014 - 16:21

score 14.7k · Answer 9 · 2014-01-22 16:55:51

14.7k

Views

Tricks - Prove Homomorphism Maps Identity to Identity - Fraleigh p. 128 Theorem 13.12(1.)

Published on 22 Jan 2014 - 16:55

score 2.7k · Answer 10 · 2026-04-12 09:37:29

2.7k

Views

curvature of helix

Published on 12 Apr 2026 - 9:37

score 278 · Answer 11 · 2014-01-23 22:02:53

278

Views

What are the coefficients of these trigonometric sums?

Published on 23 Jan 2014 - 22:02

score 336 · Answer 12 · 2026-03-28 09:42:23

336

Views

Intuition - Homomorphic Image of Group Element is Coset - Fraleigh p. 135 13.52, p.130 Theorem 13.15

Published on 28 Mar 2026 - 9:42

score 131 · Answer 13 · 2014-01-24 18:38:25

131

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Is there a nontrivial homomorphism for each of the given groups? - Fraleigh p. 134 13.38, 13.41, 13.43

Published on 24 Jan 2014 - 18:38

score 291 · Answer 14 · 2026-04-10 07:31:09

291

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How do I convince someone that $\mathbb{R}^2$ and its copy inside $\mathbb{R}^3$ are different?

Published on 10 Apr 2026 - 7:31

score 576 · Answer 15 · 2026-03-28 09:42:24

576

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Visualise all vectors perpendicular to one vector and two vectors in R^3 [Strang P19 1.2.6]

Published on 28 Mar 2026 - 9:42

List Question

What is the intuition behind $\Delta_1^0$ sets and $\Delta_1^1$ sets?

How can you describe topology to a non-mathematician without using continuous deformations?

Countably or Uncountably Many Discontinuities

Why is the derivative a limit?

When can I successfully move differentiation from inside a summation to outside?

Cross Product Component Values

A subgroup has the same number of left and right cosets - Tricks - Fraleigh p. 103 10.32, 35

Intuition and Strategy - Index of Subgroup of Subgroup Proof - Fraleigh p. 103 10.38

Tricks - Prove Homomorphism Maps Identity to Identity - Fraleigh p. 128 Theorem 13.12(1.)

curvature of helix

What are the coefficients of these trigonometric sums?

Intuition - Homomorphic Image of Group Element is Coset - Fraleigh p. 135 13.52, p.130 Theorem 13.15

Is there a nontrivial homomorphism for each of the given groups? - Fraleigh p. 134 13.38, 13.41, 13.43

How do I convince someone that $\mathbb{R}^2$ and its copy inside $\mathbb{R}^3$ are different?

Visualise all vectors perpendicular to one vector and two vectors in R^3 [Strang P19 1.2.6]

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