Point at infinity complex field, the set of points at infinity is a manifold. In artistic drawing and technical perspective, the projection on the picture plane of the point at infinity of a class of parallel lines is called their vanishing point. In hyperbolic geometry, points at infinity are typically named ideal points. Unlike Euclidean and elliptic geometries, each line has two points at infinity: given a line "l" and a point "P" not on "l", the right- and left-limiting parallels converge asymptotically to different points at infinity. All points at infinity together form the Cayley absolute or boundary of a hyperbolic plane.
Point-to-point Lee model Point-to-point Lee model The Lee model for point-to-point mode is a radio propagation model that operates around 900 MHz. Built as two different modes, this model includes an adjustment factor that can be adjusted to make the model more flexible to different regions of propagation. This model is suitable for using in data collected in a specific area for point-to-point links. Frequency: 900 MHz band The Lee model for point to point mode is formally expressed as: formula_1 where, "L" = The median path loss. Unit: decibel (dB) "L" = The reference path loss along 1 km. Unit: decibel (dB)