Question

How to prove that in an abelian group $-(-a) = a$?

score 51 · Answer 1 · 2019-04-30 04:35:37

51

Views

How to prove that in an abelian group $-(-a) = a$?

Published on 30 Apr 2019 - 4:35

score 189 · Answer 2 · 2019-04-30 17:52:41

189

Views

Given to find $\arccos\left(\cos(\frac{14 \pi}{3})\right)$

Published on 30 Apr 2019 - 17:52

score 232 · Answer 3 · 2026-03-25 04:36:10

232

Views

Invertible elements in a discrete valuation ring

Published on 25 Mar 2026 - 4:36

score 74 · Answer 4 · 2019-05-05 13:19:58

Proving $\tan^{-1}\frac{1}{2\cdot1^{2}}+\tan^{-1}\frac{1}{2\cdot2^{2}}+\cdots+\tan^{-1}\frac{1}{2\cdot n^{2}}=\frac{\pi}{4}-\tan^{-1}\frac{1}{2n+1}$

score 85 · Answer 5 · 2019-05-05 13:21:26

85

Views

Writing $B^{-1}$ in terms of $I, B, B^2$.

Published on 05 May 2019 - 13:21

score 461 · Answer 6 · 2026-02-23 06:18:19

461

Views

MATLAB/EXCEL Inverse Cumulative Distribution Function (ICDF) for Negative Binomial Distribution

Published on 23 Feb 2026 - 6:18

score 61 · Answer 7 · 2019-05-06 22:39:34

61

Views

Inverse of $2 − 3i \text{ in } \Bbb Q(i).$

Published on 06 May 2019 - 22:39

score 53 · Answer 8 · 2019-05-07 01:55:18

53

Views

How does this matrix math with complex numbers work/where is the mistake.

Published on 07 May 2019 - 1:55

score 101 · Answer 9 · 2019-05-07 03:04:31

101

Views

Inverse of $α∈Z_3(α)$ where $α^3+α^2+2=0$

Published on 07 May 2019 - 3:04

score 68 · Answer 10 · 2019-05-07 05:31:48

68

Views

Why if $B$ isn' t invertible then there exists $x\neq 0$ such that $Bx=0$?

Published on 07 May 2019 - 5:31

score 218 · Answer 11 · 2026-03-26 12:35:20

218

Views

Invertibility of a matrix in portfolio optimization

Published on 26 Mar 2026 - 12:35

score 116 · Answer 12 · 2019-05-07 21:20:05

116

Views

How to compute the inverse of $I + A$, where $A$ is skew-symmetric?

Published on 07 May 2019 - 21:20

score 654 · Answer 13 · 2019-05-09 14:35:37

654

Views

Finding analytical solution for Matrix inverse with an unknown

Published on 09 May 2019 - 14:35

score 153 · Answer 14 · 2026-03-26 18:30:09

153

Views

Definite integral containing 2 trig functions and a square root function

Published on 26 Mar 2026 - 18:30

score 2.3k · Answer 15 · 2019-05-14 11:30:23

2.3k

Views

Show $4x^2+6x+3$ is a unit in $\mathbb{Z}_8[x]$ (inverting unit + nilpotent)

Published on 14 May 2019 - 11:30

List Question

How to prove that in an abelian group $-(-a) = a$?

Given to find $\arccos\left(\cos(\frac{14 \pi}{3})\right)$

Invertible elements in a discrete valuation ring

Proving $\tan^{-1}\frac{1}{2\cdot1^{2}}+\tan^{-1}\frac{1}{2\cdot2^{2}}+\cdots+\tan^{-1}\frac{1}{2\cdot n^{2}}=\frac{\pi}{4}-\tan^{-1}\frac{1}{2n+1}$

Writing $B^{-1}$ in terms of $I, B, B^2$.

MATLAB/EXCEL Inverse Cumulative Distribution Function (ICDF) for Negative Binomial Distribution

Inverse of $2 − 3i \text{ in } \Bbb Q(i).$

How does this matrix math with complex numbers work/where is the mistake.

Inverse of $α∈Z_3(α)$ where $α^3+α^2+2=0$

Why if $B$ isn' t invertible then there exists $x\neq 0$ such that $Bx=0$?

Invertibility of a matrix in portfolio optimization

How to compute the inverse of $I + A$, where $A$ is skew-symmetric?

Finding analytical solution for Matrix inverse with an unknown

Definite integral containing 2 trig functions and a square root function

Show $4x^2+6x+3$ is a unit in $\mathbb{Z}_8[x]$ (inverting unit + nilpotent)

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