Question

If $A$ is normal: why $\sigma(A)=\sigma_\pi(A)$ implies that $\omega(A)\geq r(A)$?

score 45 · Answer 1 · 2026-04-02 07:09:54

45

Views

If $A$ is normal: why $\sigma(A)=\sigma_\pi(A)$ implies that $\omega(A)\geq r(A)$?

Published on 02 Apr 2026 - 7:09

score 93 · Answer 2 · 2019-02-24 16:38:28

93

Views

A possible typo in a proof about closure in textbook Introduction to Set Theory 3rd by Hrbacek and Jech

Published on 24 Feb 2019 - 16:38

score 44 · Answer 3 · 2019-02-25 03:47:08

44

Views

Explain how to prove this probability function

Published on 25 Feb 2019 - 3:47

score 161 · Answer 4 · 2019-02-25 08:53:36

If $\langle a_n \rangle_{n=0}^\infty$ is convergent and $\lim_{n \to \infty}a_n=a$, then for every nonprincipal ultrafilter $U$, $\lim_U a_n=a$

score 53 · Answer 5 · 2019-02-25 15:12:47

53

Views

Proof verification: If $f:A\rightarrow B$ and $S \subset T \subset A$, then $f(S) \subset f(T)$

Published on 25 Feb 2019 - 15:12

score 77 · Answer 6 · 2019-02-25 16:01:43

77

Views

Why is there an unstrict inequality in this proof? (uniform convergence of sequence of functions)

Published on 25 Feb 2019 - 16:01

score 227 · Answer 7 · 2019-02-25 20:36:00

227

Views

Proof verification : If $S$ and $T$ are subsets of $B$ with $S \subset T$, prove $f^{-1}(S)\subset f^{-1}(T)$

Published on 25 Feb 2019 - 20:36

score 682 · Answer 8 · 2026-03-28 22:53:27

682

Views

Geodesically complete implies exponential map defined on all of $T_pM$

Published on 28 Mar 2026 - 22:53

score 537 · Answer 9 · 2026-03-25 03:21:16

537

Views

Motivation for the definition of weak solutions to parabolic equations of second order

Published on 25 Mar 2026 - 3:21

score 239 · Answer 10 · 2026-03-31 20:33:11

239

Views

Remembering the golden ratio

Published on 31 Mar 2026 - 20:33

score 201 · Answer 11 · 2026-03-27 22:03:53

201

Views

Cauchy-Schwarz Master Class Exercise 1.13

Published on 27 Mar 2026 - 22:03

score 63 · Answer 12 · 2026-03-31 00:01:35

63

Views

Prove $\int_{-\infty}^{\infty}{e^{itx}\frac{1-\cos{x}}{x^2}dx}=\frac{1}{2}(|t+1|+|t-1|-2|t|)\int_{-\infty}^{\infty}{\frac{1-\cos{x}}{x^2}dx}$

Published on 31 Mar 2026 - 0:01

score 39 · Answer 13 · 2026-03-31 03:33:32

39

Views

Let $P(n)$ be the following implication: If $a, c, b_1, \ldots , b_n \in \Bbb Z$

Published on 31 Mar 2026 - 3:33

score 83 · Answer 14 · 2019-02-27 10:07:47

83

Views

Algebraic Geometry Proof Explanation

Published on 27 Feb 2019 - 10:07

score 53 · Answer 15 · 2019-02-27 14:05:21

53

Views

If $A$ is infinite, $B$ is finite and $B \subset A$ and $C=A\setminus B$. Is there bijection between A and C?

Published on 27 Feb 2019 - 14:05

List Question

If $A$ is normal: why $\sigma(A)=\sigma_\pi(A)$ implies that $\omega(A)\geq r(A)$?

A possible typo in a proof about closure in textbook Introduction to Set Theory 3rd by Hrbacek and Jech

Explain how to prove this probability function

If $\langle a_n \rangle_{n=0}^\infty$ is convergent and $\lim_{n \to \infty}a_n=a$, then for every nonprincipal ultrafilter $U$, $\lim_U a_n=a$

Proof verification: If $f:A\rightarrow B$ and $S \subset T \subset A$, then $f(S) \subset f(T)$

Why is there an unstrict inequality in this proof? (uniform convergence of sequence of functions)

Proof verification : If $S$ and $T$ are subsets of $B$ with $S \subset T$, prove $f^{-1}(S)\subset f^{-1}(T)$

Geodesically complete implies exponential map defined on all of $T_pM$

Motivation for the definition of weak solutions to parabolic equations of second order

Remembering the golden ratio

Cauchy-Schwarz Master Class Exercise 1.13

Prove $\int_{-\infty}^{\infty}{e^{itx}\frac{1-\cos{x}}{x^2}dx}=\frac{1}{2}(|t+1|+|t-1|-2|t|)\int_{-\infty}^{\infty}{\frac{1-\cos{x}}{x^2}dx}$

Let $P(n)$ be the following implication: If $a, c, b_1, \ldots , b_n \in \Bbb Z$

Algebraic Geometry Proof Explanation

If $A$ is infinite, $B$ is finite and $B \subset A$ and $C=A\setminus B$. Is there bijection between A and C?

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