Question

Can this statement about supremum be proven directly?

score 52 · Answer 1 · 2018-03-20 23:42:18

52

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Can this statement about supremum be proven directly?

Published on 20 Mar 2018 - 23:42

score 70 · Answer 2 · 2026-03-24 22:09:44

70

Views

Can a physical parameter originally defined as a scalar be shown to be a tensor through its relationship to another parameter that is a tensor?

Published on 24 Mar 2026 - 22:09

score 124 · Answer 3 · 2018-03-22 14:07:27

124

Views

If $U$ is simply connected and $u: U\to\Bbb R$ is harmonic then it have a conjugate in $U$

Published on 22 Mar 2018 - 14:07

score 14.2k · Answer 4 · 2018-03-25 03:32:24

14.2k

Views

Proving that a matrix is invertible without using determinants

Published on 25 Mar 2018 - 3:32

score 519 · Answer 5 · 2026-03-24 22:51:06

519

Views

Explanation to PDE $u_{tt}-c^2u_{xx}=0$ solution

Published on 24 Mar 2026 - 22:51

score 56 · Answer 6 · 2018-03-26 02:17:09

56

Views

Is it okay to prove this by contradiction?

Published on 26 Mar 2018 - 2:17

score 164 · Answer 7 · 2026-03-25 17:36:25

164

Views

How to prove that $\alpha^p = 1$ using induction?

Published on 25 Mar 2026 - 17:36

score 101 · Answer 8 · 2026-03-25 11:26:03

101

Views

$A289B$ is divisible by $90$, then what is $A+B$?

Published on 25 Mar 2026 - 11:26

score 115 · Answer 9 · 2018-03-29 00:04:11

115

Views

$\sum_{1}^{n}\left ( a_{i}b_{i} \right )\geq \prod_{1}^{n}\left ( a_{i}^{b_{i}} \right )$

Published on 29 Mar 2018 - 0:04

score 820 · Answer 10 · 2018-03-29 00:52:42

820

Views

Find the distribution of $ R=\sqrt{X^2+Y^2}$ where $ (X,Y)$ is uniform on the unit ball (new version)

Published on 29 Mar 2018 - 0:52

score 384 · Answer 11 · 2018-03-29 03:45:48

384

Views

Proving $\frac{a}{a+ b}+ \frac{b}{b+ c}+ \frac{c}{2c+ 5a}\geq \frac{38}{39}$

Published on 29 Mar 2018 - 3:45

score 157 · Answer 12 · 2018-03-31 02:09:52

157

Views

Given three positive numbers $x,y,z$. Prove that $(x+y-z)(\frac{3}{x+y}-\frac{1}{y+z}-\frac{1}{z+x})\leqq\frac{1}{2}$ .

Published on 31 Mar 2018 - 2:09

score 95 · Answer 13 · 2026-03-24 23:45:17

95

Views

Find all natural numbers $n$ for which $n = n'$

Published on 24 Mar 2026 - 23:45

score 131 · Answer 14 · 2018-04-01 19:17:20

131

Views

Prove the center of the unit circle has the highest average ray length?

Published on 01 Apr 2018 - 19:17

score 928 · Answer 15 · 2026-03-25 12:32:50

928

Views

Showing that a harmonic function maps open sets to open sets.

Published on 25 Mar 2026 - 12:32

List Question

Can this statement about supremum be proven directly?

Can a physical parameter originally defined as a scalar be shown to be a tensor through its relationship to another parameter that is a tensor?

If $U$ is simply connected and $u: U\to\Bbb R$ is harmonic then it have a conjugate in $U$

Proving that a matrix is invertible without using determinants

Explanation to PDE $u_{tt}-c^2u_{xx}=0$ solution

Is it okay to prove this by contradiction?

How to prove that $\alpha^p = 1$ using induction?

$A289B$ is divisible by $90$, then what is $A+B$?

$\sum_{1}^{n}\left ( a_{i}b_{i} \right )\geq \prod_{1}^{n}\left ( a_{i}^{b_{i}} \right )$

Find the distribution of $ R=\sqrt{X^2+Y^2}$ where $ (X,Y)$ is uniform on the unit ball (new version)

Proving $\frac{a}{a+ b}+ \frac{b}{b+ c}+ \frac{c}{2c+ 5a}\geq \frac{38}{39}$

Given three positive numbers $x,y,z$. Prove that $(x+y-z)(\frac{3}{x+y}-\frac{1}{y+z}-\frac{1}{z+x})\leqq\frac{1}{2}$ .

Find all natural numbers $n$ for which $n = n'$

Prove the center of the unit circle has the highest average ray length?

Showing that a harmonic function maps open sets to open sets.

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