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15
Math.TechQA.Club
2018-10-09 15:50:58
144
Views
Without the Axiom of Choice, must two nonempty sets have a surjection between them?
Published on
09 Oct 2018 - 15:50
#functions
#set-theory
#relations
#cardinals
#axiom-of-choice
1.6k
Views
For$ a, b \in \mathbb{Z}$ define $a\sim b$, if and only if $a^2 – b^2$ is divisible by $3$.
Published on
22 Mar 2026 - 2:06
#relations
#equivalence-relations
23
Views
Proving unit relation features
Published on
10 Oct 2018 - 9:57
#proof-writing
#proof-explanation
#relations
30
Views
If $R_{1}$, $R_{2}$, and $R = R_{1} \cap R_{2}$ are relations on $A$, with reflexive closures $S_{1}$, $S_{2}$, and $S$, then $S_{1} \cap S_{2} = S$?
Published on
13 Oct 2018 - 4:41
#elementary-set-theory
#proof-verification
#relations
270
Views
$S = \{(x,y): x \text{ is a sibling of } y\}$. Why is this relation not transitive?
Published on
14 Oct 2018 - 22:52
#relations
61
Views
Is the following relation considered symmetric?
Published on
25 Mar 2026 - 12:48
#logic
#relations
#boolean-algebra
#symmetric-functions
539
Views
What are relations?
Published on
17 Oct 2018 - 14:41
#relations
391
Views
Empty relation on non-empty set - is it reflexive?
Published on
18 Oct 2018 - 21:08
#discrete-mathematics
#relations
1.2k
Views
Prove/disprove, that the relation is reflexive, symmetric, antisymmetric and transitive
Published on
25 Mar 2026 - 9:32
#relations
#symmetry
84
Views
Minimal Element Definition Independent of Partial Order?
Published on
19 Oct 2018 - 22:01
#relations
#order-theory
345
Views
Find the symmetric subsets of $B = \{1,2,3,4\}$
Published on
20 Oct 2018 - 21:43
#combinatorics
#discrete-mathematics
#elementary-set-theory
#relations
105
Views
Transitive closure applied to a relation
Published on
21 Oct 2018 - 13:24
#discrete-mathematics
#elementary-set-theory
#logic
#relations
36
Views
antisymmetric proof clarification
Published on
22 Oct 2018 - 12:18
#linear-algebra
#relations
#binary
393
Views
Question about the defining equivalence relations on sets
Published on
22 Mar 2026 - 14:29
#elementary-set-theory
#relations
#equivalence-relations
210
Views
If $xR_1y$ if $x^2 + y^2$ is divisible by $5$, is the relation transitive?
Published on
24 Oct 2018 - 14:23
#relations
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