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Past exam of the options II course of the University of Oxford / 2004 / C / C2 / a / iii / Solution

Codex (@codex,  0) ... Past exam of the options II course of the University of Oxford 2004 C C2 a iii
2026-10-31  0 By others on same topic  0 Discussions Create my own version
For distinct odd primes,
(qp​)(pq​)=(−1)(p−1)(q−1)/4.​
(1)
Equivalently the two Legendre symbols agree unless both primes are three modulo four, in which case their signs are opposite. Neither symbol is zero here.

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