Question

If $AB=I$ show that $A$ has full rank.

score 281 · Answer 1 · 2026-04-15 07:24:05

281

Views

If $AB=I$ show that $A$ has full rank.

Published on 15 Apr 2026 - 7:24

score 78 · Answer 2 · 2026-04-11 18:55:44

78

Views

Prove the following by deduction rules for qualifiers and implication

Published on 11 Apr 2026 - 18:55

score 60 · Answer 3 · 2026-04-13 18:21:11

60

Views

Is the Lebesgue measure of graph of every real function equal to zero?

Published on 13 Apr 2026 - 18:21

score 43 · Answer 4 · 2026-04-16 02:39:39

43

Views

build number not divisible by given number

Published on 16 Apr 2026 - 2:39

score 68 · Answer 5 · 2026-05-10 16:34:31

68

Views

Show that there is always one integer $t$ with a least prime factor $> 5$ where $x < t \le x+6$

Published on 10 May 2026 - 16:34

score 46 · Answer 6 · 2026-04-16 23:38:13

46

Views

Solving the PDE $ku_{xx}(x,t)=u_t(x,t)$ Using Fourier Transforms

Published on 16 Apr 2026 - 23:38

score 92 · Answer 7 · 2026-04-13 12:13:10

92

Views

Proving a Lipschitz inequality for continuously differentiable functions.

Published on 13 Apr 2026 - 12:13

score 245 · Answer 8 · 2026-04-17 09:22:30

245

Views

If $m^{}(E)<\infty$, then $E$ is measurable iff $m^{}((a,b)\cap E)+m^{*}((a,b)\sim E)=b-a$ for all $a<b$.

Published on 17 Apr 2026 - 9:22

score 1.4k · Answer 9 · 2026-04-17 06:19:50

1.4k

Views

Proving $\int_{0}^{\infty}\frac{w^3\sin(wx)}{w^4+4} \ dw=\frac{\pi}{2}e^{-x}\cos(x)$

Published on 17 Apr 2026 - 6:19

score 428 · Answer 10 · 2026-04-15 19:09:40

428

Views

Is $\zeta(s)\sim\sqrt{\frac{\zeta(4s)}{\zeta(2s)}}\prod\limits_{n=1}^\infty\big(1-\frac{2}{p_n^s+p_n^{-s}}\big)^{-1/2}$?

Published on 15 Apr 2026 - 19:09

score 83 · Answer 11 · 2026-04-30 02:04:12

83

Views

A finite model of power set

Published on 30 Apr 2026 - 2:04

score 340 · Answer 12 · 2026-05-14 17:14:02

340

Views

My attempt at finding the Galois group of $E:\Bbb Q$, where $E$ is the splitting field of $x^3-5$

Published on 14 May 2026 - 17:14

score 61 · Answer 13 · 2026-04-16 04:46:07

61

Views

Is my evaluation of this limit correct/sufficient?

Published on 16 Apr 2026 - 4:46

score 52 · Answer 14 · 2026-04-11 07:06:45

52

Views

Proof Checking: Corollary epsilon delta definition of limit

Published on 11 Apr 2026 - 7:06

score 142 · Answer 15 · 2026-04-12 08:33:34

142

Views

If $E$ is a subset of $\mathbb{R}$ that does not contain any of its limit points, then $E$ is countable.

Published on 12 Apr 2026 - 8:33

List Question

If $AB=I$ show that $A$ has full rank.

Prove the following by deduction rules for qualifiers and implication

Is the Lebesgue measure of graph of every real function equal to zero?

build number not divisible by given number

Show that there is always one integer $t$ with a least prime factor $> 5$ where $x < t \le x+6$

Solving the PDE $ku_{xx}(x,t)=u_t(x,t)$ Using Fourier Transforms

Proving a Lipschitz inequality for continuously differentiable functions.

If $m^{}(E)<\infty$, then $E$ is measurable iff $m^{}((a,b)\cap E)+m^{*}((a,b)\sim E)=b-a$ for all $a<b$.

Proving $\int_{0}^{\infty}\frac{w^3\sin(wx)}{w^4+4} \ dw=\frac{\pi}{2}e^{-x}\cos(x)$

Is $\zeta(s)\sim\sqrt{\frac{\zeta(4s)}{\zeta(2s)}}\prod\limits_{n=1}^\infty\big(1-\frac{2}{p_n^s+p_n^{-s}}\big)^{-1/2}$?

A finite model of power set

My attempt at finding the Galois group of $E:\Bbb Q$, where $E$ is the splitting field of $x^3-5$

Is my evaluation of this limit correct/sufficient?

Proof Checking: Corollary epsilon delta definition of limit

If $E$ is a subset of $\mathbb{R}$ that does not contain any of its limit points, then $E$ is countable.

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