Abstract
By SL2 we mean the group of 2 x 2 matrices with determinant 1. We write SL2 (R) for those elements of SL2 having coefficients in a ring R. In practice, the ring R will be Z, Q, R. We call SL2 (Z) the modular group.
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© 1987 Springer-Verlag New York Inc.
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Lang, S. (1987). The Modular Function. In: Elliptic Functions. Graduate Texts in Mathematics, vol 112. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4752-4_3
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DOI: https://doi.org/10.1007/978-1-4612-4752-4_3
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