Question

Need clarification of "conforming subsets" in “A Simple Proof of Zorn's Lemma” by J. Lewin

score 172 · Answer 1 · 2026-04-13 06:58:58

172

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Need clarification of "conforming subsets" in “A Simple Proof of Zorn's Lemma” by J. Lewin

Published on 13 Apr 2026 - 6:58

score 616 · Answer 2 · 2026-04-13 15:03:23

616

Views

Let $z, w \in \mathbb{C}$. Prove that if $zw$ and $z + w \in \mathbb{R}$, then $z = \bar{w}$

Published on 13 Apr 2026 - 15:03

score 73 · Answer 3 · 2026-04-11 13:43:15

73

Views

Help for a proof with vectors and matrix

Published on 11 Apr 2026 - 13:43

score 612 · Answer 4 · 2026-04-16 05:42:46

612

Views

Prove that there exists a unique linear map that extends the map from a basis

Published on 16 Apr 2026 - 5:42

score 1.2k · Answer 5 · 2026-04-12 14:30:21

1.2k

Views

Why is a dual cone convex

Published on 12 Apr 2026 - 14:30

score 268 · Answer 6 · 2026-04-18 11:43:33

268

Views

Proof of the existence of a unique linear transformation

Published on 18 Apr 2026 - 11:43

score 192 · Answer 7 · 2026-04-18 11:40:28

192

Views

First isomorphism theorem for groups proof that function is well-defined

Published on 18 Apr 2026 - 11:40

score 106 · Answer 8 · 2026-04-15 21:24:50

106

Views

Let G be a Group and $a,b \in G$. If $a$ and $b$ commute and $|a|$ and $|b|$ are finite. What can be possible values for $|ab|$?

Published on 15 Apr 2026 - 21:24

score 42 · Answer 9 · 2026-04-15 20:10:03

If $f(x)$ is continuous on $[0,1], \text{ and } 0\leq f(x)\leq1, \forall x \in [0,1], \text{ prove } \exists t \in [0,1] \text{ s.t. } f(t) = t$

score 72 · Answer 10 · 2026-04-15 08:03:29

72

Views

Understanding $(n \cdot 1)(m \cdot 1) = (nm) \cdot 1$

Published on 15 Apr 2026 - 8:03

score 270 · Answer 11 · 2026-04-14 05:34:38

270

Views

For an induction proof involving sigma starting at 0 can our base case be non-zero?

Published on 14 Apr 2026 - 5:34

score 135 · Answer 12 · 2026-04-15 03:22:46

135

Views

The closure of a rational polyhedron is a rational polyhedron.

Published on 15 Apr 2026 - 3:22

score 106 · Answer 13 · 2026-04-12 06:25:17

106

Views

Need clarification on Abbott's Proof of the Algebraic Limit Theorem for Sequences

Published on 12 Apr 2026 - 6:25

score 98 · Answer 14 · 2026-04-17 00:32:25

98

Views

Prove that the area of the triangle formed by the centers of the circumferences ex-inscribed is $\frac{abc}{2r}$

Published on 17 Apr 2026 - 0:32

score 96 · Answer 15 · 2026-04-12 06:19:54

96

Views

Confusion about unjustified argument in solution to IMO 2018 algebra problem

Published on 12 Apr 2026 - 6:19

List Question

Need clarification of "conforming subsets" in “A Simple Proof of Zorn's Lemma” by J. Lewin

Let $z, w \in \mathbb{C}$. Prove that if $zw$ and $z + w \in \mathbb{R}$, then $z = \bar{w}$

Help for a proof with vectors and matrix

Prove that there exists a unique linear map that extends the map from a basis

Why is a dual cone convex

Proof of the existence of a unique linear transformation

First isomorphism theorem for groups proof that function is well-defined

Let G be a Group and $a,b \in G$. If $a$ and $b$ commute and $|a|$ and $|b|$ are finite. What can be possible values for $|ab|$?

If $f(x)$ is continuous on $[0,1], \text{ and } 0\leq f(x)\leq1, \forall x \in [0,1], \text{ prove } \exists t \in [0,1] \text{ s.t. } f(t) = t$

Understanding $(n \cdot 1)(m \cdot 1) = (nm) \cdot 1$

For an induction proof involving sigma starting at 0 can our base case be non-zero?

The closure of a rational polyhedron is a rational polyhedron.

Need clarification on Abbott's Proof of the Algebraic Limit Theorem for Sequences

Prove that the area of the triangle formed by the centers of the circumferences ex-inscribed is $\frac{abc}{2r}$

Confusion about unjustified argument in solution to IMO 2018 algebra problem

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