Question

Continuity at one point $t_0$ implies continuity at a small neighborhood of $t_0$

score 30 · Answer 1 · 2026-04-16 13:26:02

30

Views

Continuity at one point $t_0$ implies continuity at a small neighborhood of $t_0$

Published on 16 Apr 2026 - 13:26

score 136 · Answer 2 · 2026-04-11 23:31:02

136

Views

Locally polyhedral and locally finitely generated cones

Published on 11 Apr 2026 - 23:31

score 51 · Answer 3 · 2026-04-16 07:53:02

51

Views

Which one of the following is/are correct?

Published on 16 Apr 2026 - 7:53

score 574 · Answer 4 · 2026-04-09 13:26:01

574

Views

Normal subgroup of a characteristic subgroup

Published on 09 Apr 2026 - 13:26

score 201 · Answer 5 · 2026-04-14 01:32:08

201

Views

Is there an open bijective map from $\mathbb{R}$ to $\mathbb{R}$ that is not continuous?

Published on 14 Apr 2026 - 1:32

score 120 · Answer 6 · 2026-04-17 13:29:57

120

Views

A lower bound for the Gamma function : $\Gamma(x)\geq (f(1-x))^x$ on $1\leq x \leq 2$

Published on 17 Apr 2026 - 13:29

score 363 · Answer 7 · 2026-04-12 10:35:33

363

Views

Example of danger of limit property

Published on 12 Apr 2026 - 10:35

score 136 · Answer 8 · 2026-04-15 05:33:58

136

Views

Dense and countable subset example of $\mathbb{R}$ without using $\mathbb{Q}$

Published on 15 Apr 2026 - 5:33

score 107 · Answer 9 · 2026-04-16 11:34:57

107

Views

Non-commutative algebra $A$ with a non-trivial maximal ideal $M$ such that $A/M$ is not a division algebra

Published on 16 Apr 2026 - 11:34

score 129 · Answer 10 · 2026-04-13 22:32:38

129

Views

What are other elegant counterexamples to the convergence of a Cauchy product?

Published on 13 Apr 2026 - 22:32

score 69 · Answer 11 · 2026-04-09 17:47:54

69

Views

Amenable group which is inverse limit of non-amenable groups

Published on 09 Apr 2026 - 17:47

score 37 · Answer 12 · 2026-04-09 18:23:14

37

Views

Is a multivariable function with coplanar tangent lines always differentiable?

Published on 09 Apr 2026 - 18:23

score 171 · Answer 13 · 2026-04-10 23:08:48

171

Views

Irreducible mapping between compact Hausdorff spaces with no singleton fibers

Published on 10 Apr 2026 - 23:08

score 49 · Answer 14 · 2026-04-14 22:45:53

49

Views

Finding counter example to the statement $\forall t \in \mathbb{R}, N(t) = \frac{\gamma^{\prime\prime}(t)}{||\gamma^{\prime\prime\prime\prime}(t)||}$

Published on 14 Apr 2026 - 22:45

score 204 · Answer 15 · 2026-04-17 12:13:22

204

Views

Product Borel $\sigma$-algebra is strictly smaller to the Borel $\sigma$-algebra of the product space

Published on 17 Apr 2026 - 12:13

List Question

Continuity at one point $t_0$ implies continuity at a small neighborhood of $t_0$

Locally polyhedral and locally finitely generated cones

Which one of the following is/are correct?

Normal subgroup of a characteristic subgroup

Is there an open bijective map from $\mathbb{R}$ to $\mathbb{R}$ that is not continuous?

A lower bound for the Gamma function : $\Gamma(x)\geq (f(1-x))^x$ on $1\leq x \leq 2$

Example of danger of limit property

Dense and countable subset example of $\mathbb{R}$ without using $\mathbb{Q}$

Non-commutative algebra $A$ with a non-trivial maximal ideal $M$ such that $A/M$ is not a division algebra

What are other elegant counterexamples to the convergence of a Cauchy product?

Amenable group which is inverse limit of non-amenable groups

Is a multivariable function with coplanar tangent lines always differentiable?

Irreducible mapping between compact Hausdorff spaces with no singleton fibers

Finding counter example to the statement $\forall t \in \mathbb{R}, N(t) = \frac{\gamma^{\prime\prime}(t)}{||\gamma^{\prime\prime\prime\prime}(t)||}$

Product Borel $\sigma$-algebra is strictly smaller to the Borel $\sigma$-algebra of the product space

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