| |
| | Homotopy lifting property -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-18) |
 | | It is designed to support the picture of X 'above' Y, by allowing a (Click link for more info and facts about homotopy) homotopy taking place in Y to be moved 'upstairs' to X. |
 | | The homotopy lifting property will hold in many situations, such as the projection in a (Click link for more info and facts about vector bundle) vector bundle, where there need be no unique way of lifting. |
 | | a lift of that map on X × 0, and a lift on Y × [0,1] such that the two lifts agree on Y × 0, the lift can be extended to a lift of the (Click link for more info and facts about homotopy) homotopy. |
| www.absoluteastronomy.com /encyclopedia/h/ho/homotopy_lifting_property.htm (248 words) |
|