Fermat difference equation | Fermat Diophantine equation

A special case of the quadratic Diophantine equation having the form x^2 - D y^2 = 1, where D>0 is a nonsquare natural number.

binary quadratic form | Diophantine equation | Diophantine equation--2nd powers | fundamental unit | Hilbert symbol | Lagrange number | monomorph | polymorph