Sheaf of planes
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 pencil or fan 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 common definition the adjective parallel can be added to it, resulting in the expression: parallel sheaf of planes.[3]
See also
- Book embedding, a notion of graph embedding onto sheafs of half-planes
Notes
- ^ Definition on Mathworld Wolfram
- ^ Sommerville, D. M. Y. (1909). "Classification of Geometries with Projective Metric". Proceedings of the Edinburgh Mathematical Society. 28: 25. doi:10.1017/S0013091500034763.
- ^ Vitutor: Sheaf of Planes