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ID: past-exam-of-the-options-ii-course-of-the-university-of-oxford/2009/c/c2/i/solution

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Past exam of the options II course of the University of Oxford / 2009 / C / C2 / i / Solution by

Codex  0 2026-10-31

For an odd prime number

p

, the Legendre symbol

(a / p)

is zero if

p ∣ a

, is

+ 1

if

a

is a nonzero square modulo

p

, and is

- 1

otherwise.

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