Question

How many injective functions $f: A \to B$ satisfy $f(a_1) = b_1$ or $f(a_2)=b_2$?

score 464 · Answer 1 · 2016-03-17 01:36:29

464

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How many injective functions $f: A \to B$ satisfy $f(a_1) = b_1$ or $f(a_2)=b_2$?

Published on 17 Mar 2016 - 1:36

score 106 · Answer 2 · 2026-03-26 09:39:19

106

Views

Partial Order Relations with irreflexive definitions

Published on 26 Mar 2026 - 9:39

score 403 · Answer 3 · 2016-03-20 20:43:50

403

Views

Listing the elements of an equivalence class

Published on 20 Mar 2016 - 20:43

score 213 · Answer 4 · 2016-03-21 10:51:21

213

Views

Having problem with finding the number of ordered pairs.

Published on 21 Mar 2016 - 10:51

score 105 · Answer 5 · 2026-04-06 23:00:23

105

Views

A book or Source to further study Relations

Published on 06 Apr 2026 - 23:00

score 961 · Answer 6 · 2016-03-24 21:16:25

961

Views

What is a minimal relation?

Published on 24 Mar 2016 - 21:16

score 67 · Answer 7 · 2026-03-10 04:23:12

67

Views

Can a tuple be defined as an instance of a relationship?

Published on 10 Mar 2026 - 4:23

score 108 · Answer 8 · 2026-03-25 06:00:11

108

Views

How Galois connections between powersets correspond to binary relations?

Published on 25 Mar 2026 - 6:00

score 80 · Answer 9 · 2026-04-05 20:17:15

80

Views

Number of symmetric relations

Published on 05 Apr 2026 - 20:17

score 76 · Answer 10 · 2016-03-28 19:56:28

76

Views

How to denote the first or the second part of a Cartesian product?

Published on 28 Mar 2016 - 19:56

score 32 · Answer 11 · 2016-03-29 04:28:37

32

Views

What are the values of the sum?

Published on 29 Mar 2016 - 4:28

score 5.2k · Answer 12 · 2016-03-29 05:19:51

5.2k

Views

Determine whether the relation is reflexive, symmetric, anti-symmetric, and/or transitive?

Published on 29 Mar 2016 - 5:19

score 707 · Answer 13 · 2016-03-29 07:25:42

Let $R_1$ and $R_2$ be the “congruent modulo 3” and the “congruent modulo 4” relations, respectively. Find $R_1\cap R_2$ and $R_1 \cup R_2$.

score 1.7k · Answer 14 · 2026-04-05 20:19:21

1.7k

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Determine whether each of these combinations of R 1 and R 2 must be an equivalence relation.

Published on 05 Apr 2026 - 20:19

score 16.8k · Answer 15 · 2016-03-29 13:24:42

16.8k

Views

Suppose that R and S are reflexive relations on a set A. Prove or disprove each of these statements.

Published on 29 Mar 2016 - 13:24

List Question

How many injective functions $f: A \to B$ satisfy $f(a_1) = b_1$ or $f(a_2)=b_2$?

Partial Order Relations with irreflexive definitions

Listing the elements of an equivalence class

Having problem with finding the number of ordered pairs.

A book or Source to further study Relations

What is a minimal relation?

Can a tuple be defined as an instance of a relationship?

How Galois connections between powersets correspond to binary relations?

Number of symmetric relations

How to denote the first or the second part of a Cartesian product?

What are the values of the sum?

Determine whether the relation is reflexive, symmetric, anti-symmetric, and/or transitive?

Let $R_1$ and $R_2$ be the “congruent modulo 3” and the “congruent modulo 4” relations, respectively. Find $R_1\cap R_2$ and $R_1 \cup R_2$.

Determine whether each of these combinations of R 1 and R 2 must be an equivalence relation.

Suppose that R and S are reflexive relations on a set A. Prove or disprove each of these statements.

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