Question

Is the solution to this integral correct

score 125 · Answer 1 · 2026-03-26 09:39:10

125

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Is the solution to this integral correct

Published on 26 Mar 2026 - 9:39

score 403 · Answer 2 · 2018-03-24 18:43:22

403

Views

Confirmation required on proof of $\forall a,b\in\mathbb{F} (\|au+bv\| = \|bu+av\|) \Leftrightarrow \|u\| = \|v\|)$

Published on 24 Mar 2018 - 18:43

score 47 · Answer 3 · 2018-03-24 19:17:33

47

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If $L_1,L_2:\ \Bbb{R}^n\ \longrightarrow\ \Bbb{R}^n$ have the same matrix representation w.r.t. a given basis, then $L_1=L_2$?

Published on 24 Mar 2018 - 19:17

score 327 · Answer 4 · 2026-03-29 11:01:23

327

Views

Show that $\mathbb{Z}$ is isomorphic to $n\mathbb{Z}$.

Published on 29 Mar 2026 - 11:01

score 541 · Answer 5 · 2026-03-25 07:43:52

541

Views

Prove that $\mathbb{Q}+ \mathbb{R}$ is not order isomorphic to $\mathbb{R}+ \mathbb{Q}$: is my proof correct?

Published on 25 Mar 2026 - 7:43

score 1.1k · Answer 6 · 2026-03-25 20:59:52

1.1k

Views

Spivak's Calculus: Chapter 1, Problem 18b (Quadratic determinant less than zero)

Published on 25 Mar 2026 - 20:59

score 28 · Answer 7 · 2018-03-24 20:41:06

28

Views

Check My Proof: if $a$ is even then $9(a +5)$ is odd

Published on 24 Mar 2018 - 20:41

score 57 · Answer 8 · 2018-03-24 22:56:49

57

Views

A question regarding a proof based on similarity between two matrices

Published on 24 Mar 2018 - 22:56

score 29 · Answer 9 · 2018-03-25 00:14:04

29

Views

If $H\unlhd A_n$ has a 3-cycle, then $H=A_n$

Published on 25 Mar 2018 - 0:14

score 115 · Answer 10 · 2026-03-25 16:40:14

115

Views

Let $f\in C(U,\Bbb C)$ holomorphic on $U\setminus L$. Show that $f$ is holomorphic in $U$

Published on 25 Mar 2026 - 16:40

score 14.2k · Answer 11 · 2026-03-25 22:09:24

14.2k

Views

Proving that a matrix is invertible without using determinants

Published on 25 Mar 2026 - 22:09

score 521 · Answer 12 · 2026-03-29 13:46:48

521

Views

What is wrong with this proof of Krull Intersection Theorem?

Published on 29 Mar 2026 - 13:46

score 7.6k · Answer 13 · 2026-03-20 05:58:46

7.6k

Views

Prove that $\mathbb{Z}[i]$ is an integral domain.

Published on 20 Mar 2026 - 5:58

score 496 · Answer 14 · 2018-03-25 05:06:23

496

Views

How to prove that $\lim_{x\to 0}\frac{x}{\sin x}=1$, knowing that $\lim_{x\to 0}\frac{\sin x}{x}=1$?

Published on 25 Mar 2018 - 5:06

score 292 · Answer 15 · 2026-03-25 06:06:29

292

Views

Proof verification: In finite abelian groups, any subgroup generated by an element of maximal order is a direct summand.

Published on 25 Mar 2026 - 6:06

List Question

Is the solution to this integral correct

Confirmation required on proof of $\forall a,b\in\mathbb{F} (\|au+bv\| = \|bu+av\|) \Leftrightarrow \|u\| = \|v\|)$

If $L_1,L_2:\ \Bbb{R}^n\ \longrightarrow\ \Bbb{R}^n$ have the same matrix representation w.r.t. a given basis, then $L_1=L_2$?

Show that $\mathbb{Z}$ is isomorphic to $n\mathbb{Z}$.

Prove that $\mathbb{Q}+ \mathbb{R}$ is not order isomorphic to $\mathbb{R}+ \mathbb{Q}$: is my proof correct?

Spivak's Calculus: Chapter 1, Problem 18b (Quadratic determinant less than zero)

Check My Proof: if $a$ is even then $9(a +5)$ is odd

A question regarding a proof based on similarity between two matrices

If $H\unlhd A_n$ has a 3-cycle, then $H=A_n$

Let $f\in C(U,\Bbb C)$ holomorphic on $U\setminus L$. Show that $f$ is holomorphic in $U$

Proving that a matrix is invertible without using determinants

What is wrong with this proof of Krull Intersection Theorem?

Prove that $\mathbb{Z}[i]$ is an integral domain.

How to prove that $\lim_{x\to 0}\frac{x}{\sin x}=1$, knowing that $\lim_{x\to 0}\frac{\sin x}{x}=1$?

Proof verification: In finite abelian groups, any subgroup generated by an element of maximal order is a direct summand.

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