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Topic: Pell type equations
Replies: 29   Last Post: Apr 29, 2012 5:37 PM

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Terry M

Posts: 15
Registered: 4/26/12
Re: Pell type equations
Posted: Apr 29, 2012 10:48 AM
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My deductions so far...

of a², b², c² and d²

no solutions if exactly three of these = 1 mod 8

if exactly one of a² and b² = 1 mod 8 and exactly one of c² and d² = 1 mod
8, then the two remaining must be equal mod 8

e.g if a² = 1 mod 8 and c²=1 mod 8 then if b² <> d² mod 8 there are no

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