Question

Counter example to $b_1^c : b_2^c \subset (b_1 : b_2)^c$

score 70 · Answer 1 · 2020-03-06 14:20:23

70

Views

Counter example to $b_1^c : b_2^c \subset (b_1 : b_2)^c$

Published on 06 Mar 2020 - 14:20

score 120 · Answer 2 · 2026-03-25 12:15:15

120

Views

Is this counterexample for $T$ closed, symmetric $\iff T$ self-adjoint valid?

Published on 25 Mar 2026 - 12:15

score 93 · Answer 3 · 2020-03-08 04:07:21

93

Views

An example of $\int_{X \times Y} f d(\mu \times \lambda )$ is finite but such that $\int_{Y} f_{x} d\lambda $ is infinite for some $x \in (0,1).$

Published on 08 Mar 2020 - 4:07

score 417 · Answer 4 · 2026-03-29 15:20:11

417

Views

Example for spectral measure and spectral decomposition

Published on 29 Mar 2026 - 15:20

score 35 · Answer 5 · 2020-03-10 11:47:49

35

Views

The origin is not a zero set in an uncountable product of intervals.

Published on 10 Mar 2020 - 11:47

score 364 · Answer 6 · 2026-03-29 16:47:37

364

Views

Why do we only consider the spectral theorem for self-adjoint operators?

Published on 29 Mar 2026 - 16:47

score 272 · Answer 7 · 2026-03-26 14:34:51

272

Views

What about of the irrationality and transcendence of expressions involving the omega constant, and/or $\pi$ and $e$?

Published on 26 Mar 2026 - 14:34

score 78 · Answer 8 · 2020-03-14 07:00:26

78

Views

Example of a concave function that grows faster than a polynomial function as $x$ goes to $-\infty$ and have larger values as well

Published on 14 Mar 2020 - 7:00

score 105 · Answer 9 · 2026-03-28 05:59:26

105

Views

Understanding part (a) Theorem 3.17 from Baby Rudin

Published on 28 Mar 2026 - 5:59

score 362 · Answer 10 · 2020-03-16 02:26:44

362

Views

An example to show that convergence of Cesaro sum to $0$ does not imply the original sequence converges to $0$.

Published on 16 Mar 2020 - 2:26

score 510 · Answer 11 · 2020-03-18 03:00:37

510

Views

Give an example of an open cover of the closed unit ball in ${l}^2$ that has no finite subcover.

Published on 18 Mar 2020 - 3:00

score 255 · Answer 12 · 2020-03-18 09:05:08

255

Views

Examples for objects which are either finite or uncountable? (like a $\sigma$-algebra)

Published on 18 Mar 2020 - 9:05

score 55 · Answer 13 · 2020-03-18 15:02:02

55

Views

Another inequality in my style

Published on 18 Mar 2020 - 15:02

score 120 · Answer 14 · 2026-03-25 22:09:15

120

Views

Creative integrals involving the Lambert $W$ function from Frullani integral

Published on 25 Mar 2026 - 22:09

score 27 · Answer 15 · 2020-03-19 14:36:50

27

Views

Is there a $C^1$-function in $\mathbb{R}$ which is not $C^2$ in whose graph you can put a sphere without touching?

Published on 19 Mar 2020 - 14:36

List Question

Counter example to $b_1^c : b_2^c \subset (b_1 : b_2)^c$

Is this counterexample for $T$ closed, symmetric $\iff T$ self-adjoint valid?

An example of $\int_{X \times Y} f d(\mu \times \lambda )$ is finite but such that $\int_{Y} f_{x} d\lambda $ is infinite for some $x \in (0,1).$

Example for spectral measure and spectral decomposition

The origin is not a zero set in an uncountable product of intervals.

Why do we only consider the spectral theorem for self-adjoint operators?

What about of the irrationality and transcendence of expressions involving the omega constant, and/or $\pi$ and $e$?

Example of a concave function that grows faster than a polynomial function as $x$ goes to $-\infty$ and have larger values as well

Understanding part (a) Theorem 3.17 from Baby Rudin

An example to show that convergence of Cesaro sum to $0$ does not imply the original sequence converges to $0$.

Give an example of an open cover of the closed unit ball in ${l}^2$ that has no finite subcover.

Examples for objects which are either finite or uncountable? (like a $\sigma$-algebra)

Another inequality in my style

Creative integrals involving the Lambert $W$ function from Frullani integral

Is there a $C^1$-function in $\mathbb{R}$ which is not $C^2$ in whose graph you can put a sphere without touching?

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