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Complex hyperbolic plane
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This paper is organized as follows: In the preliminary Section 2 we state well-known facts about the complex hyperbolic plane, its boundary, horospherical coordinates, and the Cygan metric. In Section 3 we prove the Ptolemaean inequality (Theorem 3.1), and finally in Section 4 we prove Ptolemaeus’ theorem.
13p
danhdanh27
07-01-2019
15
2
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The publisher recently asked me to write an overview of the most common subjects in a first course of Calculus at university level. I have been very pleased by this request, although the task has been far from easy. Since most students already have their recommended textbook, I decided instead to write this contribution in a totally different style, not bothering too much with rigoristic assumptions and proofs. The purpose was to explain the main ideas and to give some warnings at places where students traditionally make errors....
146p
sn_buon
29-11-2012
62
2
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