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zbMATH Open
Article . 1962
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Proceedings of the American Mathematical Society
Article . 1962 . Peer-reviewed
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Proceedings of the American Mathematical Society
Article . 1962 . Peer-reviewed
Data sources: Crossref
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An Instrument in Hyperbolic Geometry

An instrument in hyperbolic geometry
Authors: Al-Dhahir, M. W.;

An Instrument in Hyperbolic Geometry

Abstract

In addition to straight edge and compasses, the classical instruments of Euclidean geometry, we have in hyperbolic geometry the horocompass and the hypercompass. By a straight edge, or ruler, we draw the line joining any two distinct points, and by the compasses we construct a circle with given center and radius. The horocompass is used to draw a horocycle through a given point when its diameter through the point with its direction are given. If the central line and radius of a hypercycle are given, we can draw it by the hypercompass. Although ruler and compasses have been generally used in the solutions of construction problems in hyperbolic geometry [1; 2, p. 191, pp. 204-206; 3, p. 394], other instruments have been introduced, and the relationships among these instruments, together with some restrictions, have been studied in recent years [2, pp. 289-291]. An important result in this connection is the following theorem [2, p. 290].

Keywords

foundations of geometry, non-Euclidean geometry

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Average
Top 10%
Average
bronze