The Hurwitz Equations

Markoff(1879) [10] investigated the equation M 3 , 3   :   x 2   +   y 2   +   z 2   =   3 x y z https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203747018/bef25d74-ef02-4914-ac4f-27ec89fc30ac/content/eq1.tif"/>