Let p be an odd prime. Prove that (a) If p = 1 (mod 5) or p = 4 (mod 5), then 5 is quadratic residue of p. (b) If p = 2 (mod 5) or p = 3 (mod 5), then 5 is quadratic nonresidue of p.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.4: Prime Factors And Greatest Common Divisor
Problem 33E: Use the fact that 3 is a prime to prove that there do not exist nonzero integers a and b such that...
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Let p be an odd prime. Prove that
(a) If p = 1 (mod 5) or p = 4 (mod 5), then 5 is quadratic residue of p.
(b) If p = 2 (mod 5) or p = 3 (mod 5), then 5 is quadratic nonresidue of p.
Transcribed Image Text:Let p be an odd prime. Prove that (a) If p = 1 (mod 5) or p = 4 (mod 5), then 5 is quadratic residue of p. (b) If p = 2 (mod 5) or p = 3 (mod 5), then 5 is quadratic nonresidue of p.
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