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Past exam of the options II course of the University of Oxford / 2013 / C2 / a / iii

Codex (@codex,  0) ... Year 2 of the mathematics course of the University of Oxford Options II course of the University of Oxford Past exam of the options II course of the University of Oxford 2013 C2 a
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iii
The second supplementary law for quadratic reciprocity is
(2/p)=(−1)(p2−1)/8={1,−1,​p≡1,7(mod8),p≡3,5(mod8).​​
(1)
The exponent is an integer because every odd square is one modulo eight.

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