Question

How to prove that symmetric closure of reflexive closure is identical to reflexive closure of symmetric closure?

score 548 · Answer 1 · 2026-03-26 01:23:28

548

Views

How to prove that symmetric closure of reflexive closure is identical to reflexive closure of symmetric closure?

Published on 26 Mar 2026 - 1:23

score 101 · Answer 2 · 2026-03-25 11:01:01

101

Views

Bezout identity on polynomial ring $\Bbb Q[x]$

Published on 25 Mar 2026 - 11:01

score 130 · Answer 3 · 2018-06-26 14:39:53

130

Views

Abstract Algebra: Proof Verification Permutations on a Finite Set

Published on 26 Jun 2018 - 14:39

score 72 · Answer 4 · 2018-06-26 15:36:31

72

Views

The De Morgan Formulas (for finite sets )

Published on 26 Jun 2018 - 15:36

score 1.2k · Answer 5 · 2026-03-25 19:03:13

1.2k

Views

Is there partial order over $\{1,2,3,4\}$ such that there're two maximal elements and one least element?

Published on 25 Mar 2026 - 19:03

score 80 · Answer 6 · 2018-06-26 18:14:46

80

Views

Monotone non-(in)decreasing sequences of subsets of $\Omega$

Published on 26 Jun 2018 - 18:14

score 64 · Answer 7 · 2018-06-26 20:06:17

64

Views

Let $f:[a,b] \to \mathbb{R}$ be bounded, prove that if $ L(f,P_1)<L(f,P_2)$ then $U(f,P_2)<U(f,P_1)$

Published on 26 Jun 2018 - 20:06

score 63 · Answer 8 · 2018-06-27 00:13:45

63

Views

Q: Proof Involving Natural Numbers and Perfect Squares

Published on 27 Jun 2018 - 0:13

score 64 · Answer 9 · 2026-03-23 10:27:51

64

Views

Given a square grid of side length N and m objects, design a bijection between each object and a unique set of coordinates

Published on 23 Mar 2026 - 10:27

score 53 · Answer 10 · 2018-06-27 02:18:44

53

Views

Suppose that $(k_n\mid n\in\mathbb N)$ is a decreasing sequence in $\mathbb N$. Then $(k_n\mid n\in\mathbb N)$ is eventually constant.

Published on 27 Jun 2018 - 2:18

score 59 · Answer 11 · 2026-03-25 07:48:47

59

Views

Wrong proof for the variance of a sum of normally-distributed variables?

Published on 25 Mar 2026 - 7:48

score 37 · Answer 12 · 2026-03-26 14:35:05

37

Views

Is $\forall x\exists y((y<x)\land (x<y+5))$ true if $x,y \in \mathbb N$ and $x,y\in \mathbb Z$?

Published on 26 Mar 2026 - 14:35

score 407 · Answer 13 · 2026-03-25 09:53:34

407

Views

Delta and Theta functions

Published on 25 Mar 2026 - 9:53

score 187 · Answer 14 · 2026-03-24 23:46:45

187

Views

Linearity of the adjoint transformation of a bilinear map

Published on 24 Mar 2026 - 23:46

score 58 · Answer 15 · 2026-03-28 03:01:04

58

Views

Sufficiency implies Sufficiency and Necessity

Published on 28 Mar 2026 - 3:01

List Question

How to prove that symmetric closure of reflexive closure is identical to reflexive closure of symmetric closure?

Bezout identity on polynomial ring $\Bbb Q[x]$

Abstract Algebra: Proof Verification Permutations on a Finite Set

The De Morgan Formulas (for finite sets )

Is there partial order over $\{1,2,3,4\}$ such that there're two maximal elements and one least element?

Monotone non-(in)decreasing sequences of subsets of $\Omega$

Let $f:[a,b] \to \mathbb{R}$ be bounded, prove that if $ L(f,P_1)<L(f,P_2)$ then $U(f,P_2)<U(f,P_1)$

Q: Proof Involving Natural Numbers and Perfect Squares

Given a square grid of side length N and m objects, design a bijection between each object and a unique set of coordinates

Suppose that $(k_n\mid n\in\mathbb N)$ is a decreasing sequence in $\mathbb N$. Then $(k_n\mid n\in\mathbb N)$ is eventually constant.

Wrong proof for the variance of a sum of normally-distributed variables?

Is $\forall x\exists y((y<x)\land (x<y+5))$ true if $x,y \in \mathbb N$ and $x,y\in \mathbb Z$?

Delta and Theta functions

Linearity of the adjoint transformation of a bilinear map

Sufficiency implies Sufficiency and Necessity

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