A pseudosphere
In the library Bolyai-Teleki, in Târgu Mureş (Romania), this label introduces the model of a pseudosphere, where we can see that, in hyperbolic geometry, there are more than one line that pass through a point and are parallel to a given line. We also see that the sum of the internal angles of a triangle is smaller than 180°.
© matematita
The image belongs to the sections...:
Hyperbolic geometry (Other geometries)
