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Date: 5-11-2020
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The group of all Möbius transformations of the form
(1) |
where , , , and are integers with . The group can be represented by the matrix
(2) |
where . Every can be expressed in the form
(3) |
where
(4) |
|||
(5) |
although the representation is not unique (Apostol 1997, pp. 28-29).
REFERENCES:
Apostol, T. M. "The Modular Group and Modular Functions." Ch. 2 in Modular Functions and Dirichlet Series in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 17 and 26-46, 1997.
Borwein, J. M. and Borwein, P. B. Pi & the AGM: A Study in Analytic Number Theory and Computational Complexity. New York: Wiley, p. 113, 1987.
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