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(Solution) - This exercise outlines a proof of Fermat s little theorem a Suppose

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This exercise outlines a proof of Fermat's little theorem.
a) Suppose that a is not divisible by the prime p. Show that no two of the integers 1 · a, 2 · a, . . . , (p ? 1)a are congruent modulo p.
b) Conclude from part (a) that the product of 1, 2, . . . , p ? 1 is congruent modulo p to the product of a, 2a, . . . , (p ? 1)a. Use this to show that
(p ? 1)! ? ap?1(p ? 1)! (mod p).
c) Use Theorem 7 of Section 4.3 to show from part (b) that ap?1 ? 1 (mod p) if p X a.
d) Use part (c) to show that ap ? a (mod p) for all integers a.


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This question was answered on: Jul 11, 2017

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