Hyperbolic space

Hyperbolic space is a type of non-Euclidean geometry that generalizes the concepts of traditional Euclidean geometry to a space with a constant negative curvature. In hyperbolic geometry, the parallel postulate of Euclidean geometry—specifically, that through a point not on a given line, there is exactly one line parallel to the given line—does not hold. Instead, through a point not on a given line, there are infinitely many lines that do not intersect the given line.