The Ptolemaean inequality in the closure of complex hyperbolic planes

Authors: IOANNIS D. PLATIS, NİLGÜN SÖNMEZ

Abstract: We prove the Ptolemaean inequality andPtolemaeus' theorem in the closure of complex hyperbolic planes endowed with theCygan metric.

Keywords: Complex hyperbolic plane, Cygan metric, Ptolemaean inequality, Ptolemaeus' theorem,

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