Question

Why do we think of group compositions as multiplication?

score 266 · Answer 1 · 2026-04-12 15:11:01

266

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Why do we think of group compositions as multiplication?

Published on 12 Apr 2026 - 15:11

score 2.4k · Answer 2 · 2026-04-11 20:03:04

2.4k

Views

How to remember various set operations very easily?

Published on 11 Apr 2026 - 20:03

score 491 · Answer 3 · 2026-04-11 06:53:17

491

Views

Notation to define a function mapping from a vector to a two-dimensional matrix

Published on 11 Apr 2026 - 6:53

score 71 · Answer 4 · 2026-04-15 23:39:06

71

Views

What does this notation mean: $\tiny\left(\begin{matrix} y2-N \\ d_f -c, d_f-c \end{matrix}\right)$?

Published on 15 Apr 2026 - 23:39

score 282 · Answer 5 · 2026-04-14 12:34:29

282

Views

Homomorphism Notation

Published on 14 Apr 2026 - 12:34

score 80 · Answer 6 · 2026-04-10 12:31:48

80

Views

What's the difference between $\sum_{r=1}^n(ar+b)$ and $\sum_{r=1}^nar+b$

Published on 10 Apr 2026 - 12:31

score 142 · Answer 7 · 2026-04-10 18:50:43

142

Views

How should this equation be read, $|z+1+3i|=|z-5-7i|$

Published on 10 Apr 2026 - 18:50

score 380 · Answer 8 · 2026-04-09 07:19:30

380

Views

How should trigonometric expressions be simplified?

Published on 09 Apr 2026 - 7:19

score 273 · Answer 9 · 2026-04-16 03:59:06

273

Views

Why do they use absolute value symbols for $|z|=r$ considering any number squared is positive?

Published on 16 Apr 2026 - 3:59

score 57 · Answer 10 · 2026-04-12 20:33:27

57

Views

Why using $v^T \cdot u\text{ instead of simply } v \cdot u$?

Published on 12 Apr 2026 - 20:33

score 590 · Answer 11 · 2026-04-10 19:21:34

590

Views

Strict ceiling and floor notation

Published on 10 Apr 2026 - 19:21

score 227 · Answer 12 · 2026-04-14 01:04:28

227

Views

Notation for a statistic, or function of a random variable

Published on 14 Apr 2026 - 1:04

score 516 · Answer 13 · 2026-04-12 03:19:18

516

Views

Argmax as the parameter of a function?

Published on 12 Apr 2026 - 3:19

score 161 · Answer 14 · 2026-04-15 07:20:27

161

Views

I've been told that writing $x\equiv a,b,c \pmod d$ is abuse of notation, is it really?

Published on 15 Apr 2026 - 7:20

score 62 · Answer 15 · 2026-04-12 09:16:48

62

Views

Set Notation help?

Published on 12 Apr 2026 - 9:16

List Question

Why do we think of group compositions as multiplication?

How to remember various set operations very easily?

Notation to define a function mapping from a vector to a two-dimensional matrix

What does this notation mean: $\tiny\left(\begin{matrix} y2-N \\ d_f -c, d_f-c \end{matrix}\right)$?

Homomorphism Notation

What's the difference between $\sum_{r=1}^n(ar+b)$ and $\sum_{r=1}^nar+b$

How should this equation be read, $|z+1+3i|=|z-5-7i|$

How should trigonometric expressions be simplified?

Why do they use absolute value symbols for $|z|=r$ considering any number squared is positive?

Why using $v^T \cdot u\text{ instead of simply } v \cdot u$?

Strict ceiling and floor notation

Notation for a statistic, or function of a random variable

Argmax as the parameter of a function?

I've been told that writing $x\equiv a,b,c \pmod d$ is abuse of notation, is it really?

Set Notation help?

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