Question

Proving Area of circle by triangles

score 565 · Answer 1 · 2026-04-11 16:08:09

565

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Proving Area of circle by triangles

Published on 11 Apr 2026 - 16:08

score 85 · Answer 2 · 2026-03-29 11:44:21

85

Views

Why this proof about existence of a unique linear transformation is split into three parts?

Published on 29 Mar 2026 - 11:44

score 33 · Answer 3 · 2026-04-10 15:21:42

33

Views

Removing $4K_3s$ from $K_6$ leaves no other $K_3$

Published on 10 Apr 2026 - 15:21

score 57 · Answer 4 · 2026-03-25 23:42:39

57

Views

Show that for every vector $c \in \Bbb{R}^n$, the vector $A^T(AA^T)^{-1}Ac$ is orthogonal to the null space of the matrix $A$.

Published on 25 Mar 2026 - 23:42

score 69 · Answer 5 · 2026-03-30 15:30:51

69

Views

Prove that for each e there is a partitionPe of [0,1] such thatU(f, Pe)≤1/2+e.

Published on 30 Mar 2026 - 15:30

score 75 · Answer 6 · 2018-04-05 21:50:51

75

Views

simple proof for $ \sum_{i=1}^{n} (x_i - \hat{x})=0$

Published on 05 Apr 2018 - 21:50

score 37 · Answer 7 · 2026-04-01 12:33:48

37

Views

Factorization on an arbitrary field

Published on 01 Apr 2026 - 12:33

score 1.8k · Answer 8 · 2026-03-30 17:17:19

1.8k

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Suppose that $A$ is finite and that $f:A \to B$ is surjective. Then $B$ is finite and $\vert{B}\vert \leq \vert{A}\vert$

Published on 30 Mar 2026 - 17:17

score 60 · Answer 9 · 2026-04-10 15:10:10

60

Views

Proof about properties of eigenvalues

Published on 10 Apr 2026 - 15:10

score 50 · Answer 10 · 2026-03-30 17:15:54

50

Views

$I \subseteq I_n$ and $I \neq \varnothing \implies I$ has the greatest element [Proof Verification]

Published on 30 Mar 2026 - 17:15

score 90 · Answer 11 · 2026-03-31 03:29:06

90

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$I$ is an initial segment of $\mathbb{N} \implies I=\mathbb{N}$ or $I=I_n$ [Proof Verification]

Published on 31 Mar 2026 - 3:29

score 47 · Answer 12 · 2026-03-30 17:15:44

47

Views

$n \in \mathbb{N} \wedge n>0 \iff \exists r \in \mathbb{N},n=r+1$

Published on 30 Mar 2026 - 17:15

score 285 · Answer 13 · 2026-03-30 06:46:58

285

Views

Degree of hypersurfaces in Grassmannians

Published on 30 Mar 2026 - 6:46

score 57 · Answer 14 · 2026-04-10 17:36:26

57

Views

What is this question asking in laymans terms?

Published on 10 Apr 2026 - 17:36

score 290 · Answer 15 · 2018-04-07 03:24:25

290

Views

Abbott Exercise 2.6.7

Published on 07 Apr 2018 - 3:24

List Question

Proving Area of circle by triangles

Why this proof about existence of a unique linear transformation is split into three parts?

Removing $4K_3s$ from $K_6$ leaves no other $K_3$

Show that for every vector $c \in \Bbb{R}^n$, the vector $A^T(AA^T)^{-1}Ac$ is orthogonal to the null space of the matrix $A$.

Prove that for each e there is a partitionPe of [0,1] such thatU(f, Pe)≤1/2+e.

simple proof for $ \sum_{i=1}^{n} (x_i - \hat{x})=0$

Factorization on an arbitrary field

Suppose that $A$ is finite and that $f:A \to B$ is surjective. Then $B$ is finite and $\vert{B}\vert \leq \vert{A}\vert$

Proof about properties of eigenvalues

$I \subseteq I_n$ and $I \neq \varnothing \implies I$ has the greatest element [Proof Verification]

$I$ is an initial segment of $\mathbb{N} \implies I=\mathbb{N}$ or $I=I_n$ [Proof Verification]

$n \in \mathbb{N} \wedge n>0 \iff \exists r \in \mathbb{N},n=r+1$

Degree of hypersurfaces in Grassmannians

What is this question asking in laymans terms?

Abbott Exercise 2.6.7

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