Question

Ask for example: A simple ring with zero divisors

score 240 · Answer 1 · 2019-01-10 05:20:42

240

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Ask for example: A simple ring with zero divisors

Published on 10 Jan 2019 - 5:20

score 1k · Answer 2 · 2019-01-10 18:36:29

1k

Views

Example of a primary ideal that it's not prime

Published on 10 Jan 2019 - 18:36

score 73 · Answer 3 · 2019-01-13 17:13:35

73

Views

If I used a fair coin flip to determine bets on binary outcomes, will I be correct half the time?

Published on 13 Jan 2019 - 17:13

score 793 · Answer 4 · 2019-01-15 12:22:56

793

Views

Example of a group $G$ with exactly $n$ subgroups (including the trivial one and $G$ itself).

Published on 15 Jan 2019 - 12:22

score 445 · Answer 5 · 2019-01-15 20:59:50

445

Views

A connected, but not path-connected, space whose fundamental group depends on the basepoint

Published on 15 Jan 2019 - 20:59

score 219 · Answer 6 · 2019-01-17 07:10:36

219

Views

Find a set such that $A\in B$ and $A\subseteq B$

Published on 17 Jan 2019 - 7:10

score 121 · Answer 7 · 2026-03-25 20:18:24

121

Views

An example of a Banach algebra satisfying given conditions

Published on 25 Mar 2026 - 20:18

score 718 · Answer 8 · 2026-03-25 18:55:00

718

Views

Is there any relationship between growth rate and amenability?

Published on 25 Mar 2026 - 18:55

score 58 · Answer 9 · 2026-03-27 06:08:17

58

Views

Logical mistake in a proof of Dirichlet's test

Published on 27 Mar 2026 - 6:08

score 62 · Answer 10 · 2019-01-19 09:00:33

62

Views

Does this limit exist? $\lim_{n\to\infty}\frac{φ(f(n))}{ψ(g(n))}$

Published on 19 Jan 2019 - 9:00

score 2.6k · Answer 11 · 2019-01-21 18:40:12

2.6k

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Show by means of an example that $\lim_{x \to a} [f(x)g(x)]$ may exist even though neither $\lim_{x \to a} f(x)$ nor $\lim_{x \to a} g(x)$ exists.

Published on 21 Jan 2019 - 18:40

score 169 · Answer 12 · 2019-01-21 22:23:35

169

Views

How to construct examples of maps that are open or closed or continuous but not the others?

Published on 21 Jan 2019 - 22:23

score 184 · Answer 13 · 2026-03-26 12:15:34

184

Views

Prove or disprove. Let $G$ be an abelian group. Let $N \triangleleft G$. Then, $ G\cong N \times G/N. $

Published on 26 Mar 2026 - 12:15

score 101 · Answer 14 · 2026-03-25 21:00:05

101

Views

Non-constant function with 0 Lipschitz semi-norm

Published on 25 Mar 2026 - 21:00

score 129 · Answer 15 · 2026-03-27 10:07:37

129

Views

Definition of a structure

Published on 27 Mar 2026 - 10:07

List Question

Ask for example: A simple ring with zero divisors

Example of a primary ideal that it's not prime

If I used a fair coin flip to determine bets on binary outcomes, will I be correct half the time?

Example of a group $G$ with exactly $n$ subgroups (including the trivial one and $G$ itself).

A connected, but not path-connected, space whose fundamental group depends on the basepoint

Find a set such that $A\in B$ and $A\subseteq B$

An example of a Banach algebra satisfying given conditions

Is there any relationship between growth rate and amenability?

Logical mistake in a proof of Dirichlet's test

Does this limit exist? $\lim_{n\to\infty}\frac{φ(f(n))}{ψ(g(n))}$

Show by means of an example that $\lim_{x \to a} [f(x)g(x)]$ may exist even though neither $\lim_{x \to a} f(x)$ nor $\lim_{x \to a} g(x)$ exists.

How to construct examples of maps that are open or closed or continuous but not the others?

Prove or disprove. Let $G$ be an abelian group. Let $N \triangleleft G$. Then, $ G\cong N \times G/N. $

Non-constant function with 0 Lipschitz semi-norm

Definition of a structure

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