Question
Show that if or
, then
, for
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Answer :
Word Count : 168
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Skip in 10
Assume that (5\mid (a^{2}-2b^{2})). We prove that this forces (5\mid a) and (5\mid b), which will establish the contrapositive. Working modulo (5), the quadratic residues are [ 0^{2}\equiv 0,; 1^{2}\equiv 1,; 2^{2}\equiv 4,; 3^{2}\equiv 9\equiv 4,; 4^{2}\equiv 16\equiv 1 \pmod{5}. ] Hence any square modulo (5) is (0,1,) or (4). So (a^{2}\equiv
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