Question

Is the intersection of a component and the boundary of a closed set non-empty?

score 141 · Answer 1 · 2026-03-25 23:10:12

141

Views

Is the intersection of a component and the boundary of a closed set non-empty?

Published on 25 Mar 2026 - 23:10

score 177 · Answer 2 · 2018-05-14 01:48:48

177

Views

Step in proof of $\sum_{n=1}^{\infty} \frac{1}{n^4} = \frac{\pi^4}{90}$

Published on 14 May 2018 - 1:48

score 75 · Answer 3 · 2018-05-14 05:12:15

75

Views

How to obtain $\quad P \Rightarrow Q \;\equiv\; (P \wedge Q \;\equiv\; P)$

Published on 14 May 2018 - 5:12

score 28 · Answer 4 · 2018-05-14 12:11:09

28

Views

Prove that for every $y \in [0, g(1)-g(0)]$, there exists $x\in[0,1]$ such that $g'(x)=y$.

Published on 14 May 2018 - 12:11

score 115 · Answer 5 · 2018-05-14 17:56:58

115

Views

Morphism of varieties defined by the greatest common divisor

Published on 14 May 2018 - 17:56

score 49 · Answer 6 · 2018-05-15 04:37:08

49

Views

Proving $f(x,y) > f(w,z)$ IFF $\frac{x}{w} > \frac{y}{z}$ implies $f$ is homogenous of degree $0$

Published on 15 May 2018 - 4:37

score 114 · Answer 7 · 2026-03-25 11:16:04

114

Views

Functional equation: $f(x^2+f(y))=y+f^2(x)$.

Published on 25 Mar 2026 - 11:16

score 66 · Answer 8 · 2018-05-15 06:35:59

66

Views

Proof Verification: Derivative theorem

Published on 15 May 2018 - 6:35

score 226 · Answer 9 · 2026-03-24 23:46:40

226

Views

Question on a proof of Kuratowski's Theorem in Kechris's Classical Descriptive Set Theory

Published on 24 Mar 2026 - 23:46

score 124 · Answer 10 · 2026-03-25 06:10:40

124

Views

Harmonic majoration proof. Why does domain need to be relatively compact?

Published on 25 Mar 2026 - 6:10

score 124 · Answer 11 · 2026-03-25 07:48:25

124

Views

Coproduct of totally disconnected sets is totally disconnected.

Published on 25 Mar 2026 - 7:48

score 98 · Answer 12 · 2018-05-16 16:39:17

98

Views

proving that if $x\le y$ and $y\le x$ then $x=y$

Published on 16 May 2018 - 16:39

score 906 · Answer 13 · 2026-03-26 03:23:55

906

Views

Peskin & Schroeder equation 2.54 clarification

Published on 26 Mar 2026 - 3:23

score 139 · Answer 14 · 2026-03-25 17:52:10

139

Views

How can I divine the trick of multiplying $\sec x$ by $\dfrac{\tan(x)+\sec(x)}{\tan(x)+\sec(x)}$?

Published on 25 Mar 2026 - 17:52

score 85 · Answer 15 · 2026-03-24 23:46:45

85

Views

If $f$ is continuous on $A,$ is it true that $\{x:\text{osc}_f(x)=0\}=A?$

Published on 24 Mar 2026 - 23:46

List Question

Is the intersection of a component and the boundary of a closed set non-empty?

Step in proof of $\sum_{n=1}^{\infty} \frac{1}{n^4} = \frac{\pi^4}{90}$

How to obtain $\quad P \Rightarrow Q \;\equiv\; (P \wedge Q \;\equiv\; P)$

Prove that for every $y \in [0, g(1)-g(0)]$, there exists $x\in[0,1]$ such that $g'(x)=y$.

Morphism of varieties defined by the greatest common divisor

Proving $f(x,y) > f(w,z)$ IFF $\frac{x}{w} > \frac{y}{z}$ implies $f$ is homogenous of degree $0$

Functional equation: $f(x^2+f(y))=y+f^2(x)$.

Proof Verification: Derivative theorem

Question on a proof of Kuratowski's Theorem in Kechris's Classical Descriptive Set Theory

Harmonic majoration proof. Why does domain need to be relatively compact?

Coproduct of totally disconnected sets is totally disconnected.

proving that if $x\le y$ and $y\le x$ then $x=y$

Peskin & Schroeder equation 2.54 clarification

How can I divine the trick of multiplying $\sec x$ by $\dfrac{\tan(x)+\sec(x)}{\tan(x)+\sec(x)}$?

If $f$ is continuous on $A,$ is it true that $\{x:\text{osc}_f(x)=0\}=A?$

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