Chromatic Plane Compositions
R. Pérez-Gómez, Ceferino Ruiz (2000)
Visual Mathematics
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R. Pérez-Gómez, Ceferino Ruiz (2000)
Visual Mathematics
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Vojtěch Jarník (1948)
Časopis pro pěstování matematiky a fysiky
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C. Ernesto, S. Lindgren (1974)
Gaceta Matemática
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Ana Kozomara (1999)
Visual Mathematics
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von Gagern, Martin, Richter-Gebert, Jürgen (2009)
The Electronic Journal of Combinatorics [electronic only]
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Janner, Aloysio (2008)
Computational & Mathematical Methods in Medicine
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Miguel de Guzmán (2001)
RACSAM
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A simple proof is presented of a famous, and difficult, theorem by Jakob Steiner. By means of a straightforward transformation of the triangle, the proof of the theorem is reduced to the case of the equilateral triangle. Several relations of the Steiner deltoid with the Feuerbach circle and the Morley triangle appear then as obvious.
Janković, Vladimir (1996)
Matematichki Vesnik
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Judita Cofman (1998)
The Teaching of Mathematics
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Marcel Hagelberg, Rubén A. Hidalgo (1997)
Revista Matemática Iberoamericana
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In this note we construct examples of geometric 3-orbifolds with (orbifold) fundamental group isomorphic to a (Z-extension of a) generalized Coxeter group. Some of these orbifolds have either euclidean, spherical or hyperbolic structure. As an application, we obtain an alternative proof of theorem 1 of Hagelberg, Maclaughlan and Rosenberg in [5]. We also obtain a similar result for generalized Coxeter groups.
Schnell, Uwe, Segura Gomis, Salvador (1996)
Beiträge zur Algebra und Geometrie
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Brown, Paul R. (1998)
The New York Journal of Mathematics [electronic only]
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