Sheaf of planes
(Redirected from Fan (geometry))
In mathematics, a sheaf of planes is the set of all planes that have the same common line.[1][2] It may also be known as a fan of planes or a pencil of planes.
When extending the concept of line to the line at infinity, a set of parallel planes can be seen as a sheaf of planes intersecting in a line at infinity. To distinguish it from the more general definition, the adjective parallel can be added to it, resulting in the expression parallel sheaf of planes.[3]
See also
[edit]- Book embedding, a notion of graph embedding onto sheafs of half-planes
Notes
[edit]- ^ Definition on Mathworld Wolfram
- ^ Sommerville, D. M. Y. (1909). "Classification of Geometries with Projective Metric". Proceedings of the Edinburgh Mathematical Society. 28: 25–41. doi:10.1017/S0013091500034763.
- ^ Vitutor: Sheaf of Planes