Question

Understanding a proof about regular cardinals from "Set Theory for the Working Mathematician"

score 52 · Answer 1 · 2026-03-25 19:03:52

52

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Understanding a proof about regular cardinals from "Set Theory for the Working Mathematician"

Published on 25 Mar 2026 - 19:03

score 185 · Answer 2 · 2018-09-27 05:50:13

185

Views

An inconsistence in a proof by Karel Hrbacek and Thomas Jech

Published on 27 Sep 2018 - 5:50

score 120 · Answer 3 · 2026-03-26 06:18:30

120

Views

row operation proof for elementary matrix

Published on 26 Mar 2026 - 6:18

score 163 · Answer 4 · 2018-09-27 12:45:22

163

Views

Example of a function for which $\int_1^\infty f(x)\;dx$ diverges and $\sum_{1}^\infty f(n)$ converges

Published on 27 Sep 2018 - 12:45

score 118 · Answer 5 · 2018-09-27 16:03:33

118

Views

Discrete Math "if and only if" Proof with Polynomials

Published on 27 Sep 2018 - 16:03

score 450 · Answer 6 · 2026-03-26 01:06:40

450

Views

Is a $2x2$ real matrix with complex eigenvalues upper triangular?

Published on 26 Mar 2026 - 1:06

score 173 · Answer 7 · 2026-03-26 22:19:27

173

Views

About definite integral and Gauss hypergeometric function

Published on 26 Mar 2026 - 22:19

score 163 · Answer 8 · 2018-09-28 02:09:13

163

Views

Why does $\sqrt{\frac{x^2-2x+1}{x^2-1}}$ exist at $x = 1$?

Published on 28 Sep 2018 - 2:09

score 107 · Answer 9 · 2026-03-26 07:38:47

107

Views

Confusion about the uniqueness (up to isomorphism) of $(\Bbb R,<)$

Published on 26 Mar 2026 - 7:38

score 30 · Answer 10 · 2018-09-28 09:32:31

30

Views

Clarification required on proof of $c$ being the cluster point of $A\subset S$.

Published on 28 Sep 2018 - 9:32

score 787 · Answer 11 · 2026-03-30 22:14:22

787

Views

Understanding proof of Ptolemy's theorem - how does it connect to a circle?

Published on 30 Mar 2026 - 22:14

score 81 · Answer 12 · 2026-03-27 14:30:12

81

Views

Questions derived from trying to prove Plancherel's Theorem

Published on 27 Mar 2026 - 14:30

score 263 · Answer 13 · 2026-03-25 04:42:50

263

Views

Suppose $(X, \mathcal{A})$ is a measurable space, $f$ is a real-valued function, and $\{x:f(x)>r\} \in\mathcal{A}$ for each rational number $r$.

Published on 25 Mar 2026 - 4:42

score 2.7k · Answer 14 · 2026-03-25 20:35:33

2.7k

Views

Delta-Epsilon why is deltac less than or equal to eplisonc

Published on 25 Mar 2026 - 20:35

score 46 · Answer 15 · 2018-09-28 20:28:44

46

Views

Why does is that there only has to be one $x$ needed to satisfy the equation to prove that it is a subset of the image (range)?

Published on 28 Sep 2018 - 20:28

List Question

Understanding a proof about regular cardinals from "Set Theory for the Working Mathematician"

An inconsistence in a proof by Karel Hrbacek and Thomas Jech

row operation proof for elementary matrix

Example of a function for which $\int_1^\infty f(x)\;dx$ diverges and $\sum_{1}^\infty f(n)$ converges

Discrete Math "if and only if" Proof with Polynomials

Is a $2x2$ real matrix with complex eigenvalues upper triangular?

About definite integral and Gauss hypergeometric function

Why does $\sqrt{\frac{x^2-2x+1}{x^2-1}}$ exist at $x = 1$?

Confusion about the uniqueness (up to isomorphism) of $(\Bbb R,<)$

Clarification required on proof of $c$ being the cluster point of $A\subset S$.

Understanding proof of Ptolemy's theorem - how does it connect to a circle?

Questions derived from trying to prove Plancherel's Theorem

Suppose $(X, \mathcal{A})$ is a measurable space, $f$ is a real-valued function, and $\{x:f(x)>r\} \in\mathcal{A}$ for each rational number $r$.

Delta-Epsilon why is deltac less than or equal to eplisonc

Why does is that there only has to be one $x$ needed to satisfy the equation to prove that it is a subset of the image (range)?

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