6 Introduction to transformation theory
6.1 The elliptic modular function
In Chapter 5, we considered Equation (5.11)
Then we formulated the problem of determining all the solutions τ of (6.1) for a given m and in Theorem 5.2 we stated that if τ1 is one such solution then every solution is of the form
where a, b, c, d , ad − bc = 1, a, d 1(mod ...