(c) Show that the collection {{2i] : 0 < i < n – 1} is a partition of the integers into n disjoint congruence classes modulo n if and only if n is odd.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.5: Normal Subgroups
Problem 31E
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How do you solve c)?

Recall that
Z, = {[0), [1], [2], . .. [n – 1]}
is the set of congruence classes (or equivalence classes) modulo n. For instance, Z, = {[0], [1], [2], [3), [4)}
are the congruence classes modulo 5.
(a) Show that the collection
{{2i] : 0<i< 4} = {[0], [2], [4), [6], [8]}
also forms a partition of the integers into disjoint congruence classes modulo 5.
(b) Explain why the collection
{{2i] : 0 <i< 5} = {[0], [2], [4), [6], [8], [10]}
does not form a partition of the integers into disjoint congruence classes modulo 6.
(c) Show that the collection
{{2i] : 0 <i<n - 1}
is a partition of the integers into n disjoint congruence classes modulo n if and only if n is odd.
Transcribed Image Text:Recall that Z, = {[0), [1], [2], . .. [n – 1]} is the set of congruence classes (or equivalence classes) modulo n. For instance, Z, = {[0], [1], [2], [3), [4)} are the congruence classes modulo 5. (a) Show that the collection {{2i] : 0<i< 4} = {[0], [2], [4), [6], [8]} also forms a partition of the integers into disjoint congruence classes modulo 5. (b) Explain why the collection {{2i] : 0 <i< 5} = {[0], [2], [4), [6], [8], [10]} does not form a partition of the integers into disjoint congruence classes modulo 6. (c) Show that the collection {{2i] : 0 <i<n - 1} is a partition of the integers into n disjoint congruence classes modulo n if and only if n is odd.
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