Poincaré disk model

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Science and technology

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What Wikipedia says

In geometry, the Poincaré disk model, also called the conformal disk model, is a model of 2-dimensional hyperbolic geometry in which all points are inside the unit disk, and straight lines are either circular arcs contained within the disk that are orthogonal to the unit circle or diameters of the unit circle.

Excerpt from the Wikipedia article “Poincaré disk model”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Trevorgoodchild, Public domain, via Wikimedia Commons.