Abstract
We use the following notation. First, ℤ, ℚ, ℝ and ℂ denote the integers, the rationals, the real and complex numbers respectively: ℍ denotes the set of quaternions (Section 2.4).
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© 1983 Springer Science+Business Media New York
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Beardon, A.F. (1983). Preliminary Material. In: The Geometry of Discrete Groups. Graduate Texts in Mathematics, vol 91. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1146-4_1
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DOI: https://doi.org/10.1007/978-1-4612-1146-4_1
Publisher Name: Springer, New York, NY
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