Markoff number

The Markov numbers m are the union of the solutions (x, y, z) to the Markov equation x^2 + y^2 + z^2 = 3x y z, and are related to Lagrange numbers L_n by L_n = sqrt(9 - 4/m^2).

Hurwitz equation | Hurwitz's irrational number theorem | irrationality measure | Lagrange number | Liouville's approximation theorem | Roth's theorem | Segre's theorem