The Gamma Group is the set of all transformations of the form

where , , , and are Integers and . -modular functions are then defined as in Borwein and Borwein (1987, p. 114).

**References**

Borwein, J. M. and Borwein, P. B. *Pi & the AGM: A Study in Analytic Number Theory and Computational Complexity.*
New York: Wiley, pp. 127-132, 1987.

© 1996-9

1999-05-26