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Publications by Joachim A. Hempel

A Pseudo-Trigonometry Related to Ptolemy's Theorem and the Hyperbolic Geometry of Punctured Spheres

Annales Polonici Mathematici

English

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Construction of Nearly Hyperbolic Distance on Punctured Spheres

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Smarandache Theorem in Hyperbolic Geometry

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Linear Completeness and Hyperbolic Trigonometry

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Construction of Harmonic Maps Between Pseudo-Riemannian Spheres and Hyperbolic Spaces

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Construction of Harmonic Maps Between Pseudo-Riemannian Spheres and Hyperbolic Spaces

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Ptolemy's Theorem and Certain Trigonometrical Formulæ

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Accessory Parameters for Punctured Spheres

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A New Analytic Approach to Hyperbolic Geometry

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Some Applications of Ptolemy's Theorem in Secondary School Mathematics

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