We provide a new elementary pro of of a criterion, given in earlier work, for the solvability of the Pell equation x2 − Dy2 = − 1 where D is any p ositive nonsquare integer.
We provide a new elementary pro of of a criterion, given in earlierwork, for the solvability of the Pell equation x2 − Dy2 = − 1 where D isany p ositive nonsquare integer.