(2) If a = b modn and a = b mod m and ged(m, n): 1. then a =b mod mn.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.5: Congruence Of Integers
Problem 58E: a. Prove that 10n(1)n(mod11) for every positive integer n. b. Prove that a positive integer z is...
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i  need Question 2

(1) (a) Show that the relation a = b mod n if n | a - b is an equivalence relation
(b) Show that the binary operations + is well-defined modulo n.
(2) If a = b mod n and a = b mod m and ged(m, n) = 1, then a = b mod mn.
(3) Show that for any n E N,
n(n + 1)(2n + 1)
k=1
(4) Let p be a prime number. Then r2 = 1 mod p has exactly two solutions
modulo p.
Transcribed Image Text:(1) (a) Show that the relation a = b mod n if n | a - b is an equivalence relation (b) Show that the binary operations + is well-defined modulo n. (2) If a = b mod n and a = b mod m and ged(m, n) = 1, then a = b mod mn. (3) Show that for any n E N, n(n + 1)(2n + 1) k=1 (4) Let p be a prime number. Then r2 = 1 mod p has exactly two solutions modulo p.
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