4. Show that the relation defined on Z as follows are equivalence relation (a) For all, n € Z, m R n <=> 3|(m² – n²). (b) Let A = : Z+ × Z+, define a binary relation R on A: (a, b) R (c,d) <=> a+d=c+ b for all (a, b) and (c,d) in A.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.7: Relations
Problem 6TFE: Label each of the following statements as either true or false. Let R be a relation on a nonempty...
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14. Show that the relation defined on Z as follows are equivalence relation
(a) For all, n e Z, m R n <=> 3|(m² — n²).
(b) Let A = Z+ × Z+, define a binary relation R on A:
(a, b) R (c,d) <=> a+d=c+ b for all (a, b) and (c,d) in A.
15. Prove that
(a) If A is a set, R is an equivalence relation on A, then distinct equivalence classes of
R form a partition of A; that is, the union of the equivalence classes is all of A, and
the intersection of any two distinct classes is empty.
..and a and b are elements of A,
(b) If A is a set, R is an equivalent relation on A, and a and b are elements of A, Then
either [a] n [b] = Ø or [a] = [b].
Transcribed Image Text:14. Show that the relation defined on Z as follows are equivalence relation (a) For all, n e Z, m R n <=> 3|(m² — n²). (b) Let A = Z+ × Z+, define a binary relation R on A: (a, b) R (c,d) <=> a+d=c+ b for all (a, b) and (c,d) in A. 15. Prove that (a) If A is a set, R is an equivalence relation on A, then distinct equivalence classes of R form a partition of A; that is, the union of the equivalence classes is all of A, and the intersection of any two distinct classes is empty. ..and a and b are elements of A, (b) If A is a set, R is an equivalent relation on A, and a and b are elements of A, Then either [a] n [b] = Ø or [a] = [b].
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