Question

Given function $ f : I \to \Bbb R$, if it is strictly increasing, bounded and continuous, then $I$ must be a bounded interval

score 428 · Answer 1 · 2017-03-15 20:41:35

428

Views

Given function $ f : I \to \Bbb R$, if it is strictly increasing, bounded and continuous, then $I$ must be a bounded interval

Published on 15 Mar 2017 - 20:41

score 184 · Answer 2 · 2017-03-21 14:29:21

184

Views

Apparent Contradiction by WolframAlpha in Calcuation of $\sum_{k=1}^\infty k^{k-1} e^{-k} / k!$

Published on 21 Mar 2017 - 14:29

score 180 · Answer 3 · 2017-03-25 23:27:35

180

Views

What is wrong with this proof that anti-commutative matrices have product zero?

Published on 25 Mar 2017 - 23:27

score 81 · Answer 4 · 2017-03-31 18:55:13

81

Views

$\frac{da^x}{dx}=0$?

Published on 31 Mar 2017 - 18:55

score 3.4k · Answer 5 · 2026-03-26 08:04:19

3.4k

Views

Can anything interesting be said about this fake proof?

Published on 26 Mar 2026 - 8:04

score 1.6k · Answer 6 · 2017-04-05 00:32:46

1.6k

Views

$\sqrt[n]{ab} = \sqrt[n]{a}\sqrt[n]{b} $ just for a,b>0

Published on 05 Apr 2017 - 0:32

score 45 · Answer 7 · 2023-01-31 18:14:41

45

Views

Probability density of $X_1 − 2X_2$, where $X_1, X_2$ independent and exponentially distributed.

Published on 31 Jan 2023 - 18:14

score 55 · Answer 8 · 2023-02-03 14:54:31

55

Views

I'm missing something about transfinite arithmetic using Fundamental theorem of arithmetic

Published on 03 Feb 2023 - 14:54

score 71 · Answer 9 · 2023-02-03 19:40:11

71

Views

Alternative proof of 2.36 Rudin... alternative or flawed proof?

Published on 03 Feb 2023 - 19:40

score 675 · Answer 10 · 2023-02-05 08:53:58

675

Views

Why is the volume of a cone not half the volume of the cylinder of which it is a part?

Published on 05 Feb 2023 - 8:53

score 126 · Answer 11 · 2023-02-06 18:06:18

126

Views

Find the point of contact of the plane $2x-2y+z+12=0$ with the sphere $x^2+y^2+z^2-2x-4y+2z=3.$

Published on 06 Feb 2023 - 18:06

score 119 · Answer 12 · 2023-02-07 14:51:56

119

Views

Why am I getting $\pi(n)=\operatorname{li}(n)+O\left(\log^2 n\right)$

Published on 07 Feb 2023 - 14:51

score 785 · Answer 13 · 2023-02-19 21:03:53

785

Views

Issue with a "proof" for Maschke's Theorem

Published on 19 Feb 2023 - 21:03

score 102 · Answer 14 · 2026-02-23 08:22:03

102

Views

Integral not well-defined for non-Cameron-Martin shift

Published on 23 Feb 2026 - 8:22

score 57 · Answer 15 · 2023-02-21 03:13:46

57

Views

Fake proof: in a commutative ring with no nonzero zero divisors, all irreducibles are prime.

Published on 21 Feb 2023 - 3:13

List Question

Given function $ f : I \to \Bbb R$, if it is strictly increasing, bounded and continuous, then $I$ must be a bounded interval

Apparent Contradiction by WolframAlpha in Calcuation of $\sum_{k=1}^\infty k^{k-1} e^{-k} / k!$

What is wrong with this proof that anti-commutative matrices have product zero?

$\frac{da^x}{dx}=0$?

Can anything interesting be said about this fake proof?

$\sqrt[n]{ab} = \sqrt[n]{a}\sqrt[n]{b} $ just for a,b>0

Probability density of $X_1 − 2X_2$, where $X_1, X_2$ independent and exponentially distributed.

I'm missing something about transfinite arithmetic using Fundamental theorem of arithmetic

Alternative proof of 2.36 Rudin... alternative or flawed proof?

Why is the volume of a cone not half the volume of the cylinder of which it is a part?

Find the point of contact of the plane $2x-2y+z+12=0$ with the sphere $x^2+y^2+z^2-2x-4y+2z=3.$

Why am I getting $\pi(n)=\operatorname{li}(n)+O\left(\log^2 n\right)$

Issue with a "proof" for Maschke's Theorem

Integral not well-defined for non-Cameron-Martin shift

Fake proof: in a commutative ring with no nonzero zero divisors, all irreducibles are prime.

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