List all possible equivalence relations on the set (1,2,3,4) without repetition up to isomorphism. Justify your answer.
List all possible equivalence relations on the set (1,2,3,4) without repetition up to isomorphism. Justify your answer.
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section9.3: Systems Of Inequalities
Problem 33E
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Question
I have the following exercise:
List all possible equivalence relations on the set (1,2,3,4) without repetition up to isomorphism. Justify your answer. (Q2)
I tried to solve it and got the solution which is attached. However, I feel like something is not correct, maybe I understood the question wrong? The course is abstract algebra so help is much appreciated

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Hence, R3 is not transitive.
✓
Ch
с
-D Since R3 is not symmetric and not transitive, R3 is not an equivalence
relation
Q2:
No. of partitions of a set: 2^-1 = 2ª - 1 =15.
Hence: {{1,2,3,43}, {{1},{2,3,4}},{{2},{1,3,4}}, {{33. {1,2,413}, {{4}, {1,2,333},
{ § 1,2}, {3,4} }, {§ 1.43,£2,33}, §§1,3}, {2,4}} §£1,2},{3}{433,
§ §1.33. {2}, {4}}.§£1.45,{2},{3}},{$13, 52167 18433.
{{1}, { 2,4}, {3}}, { {^}, {2}, {3,43}, {{1}, {2}, {3}, {4}}
3:
i) (R², $), where (x,y)* (a,b) = (x+a, y-b). (12²= {(2,W): Z, WER}
a) let (x,y),(a,b) ETR², where x, y, a, b ER
↳₂ (x+a). (y-b) → (x+a₁ y-b) € 12².
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