ABSTRACT
This chapter is concerned with Fricke and Klein’s exposition of automorphism groups of integral indefinite ternary quadratic forms as presented in their book “Vorlesungen über die Theorie der automorphen Funktionen” (Band I, dritter Abschnitt, zweites Kapitel: “Von den reproduzierenden Gruppen ternärer und quaternärer quadratischer Formen”). A short survey of this can be found in W. Magnus1 book “Non-Euclidean Tesselations and Their Groups,” page 133.
