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Lifting obstructions, ordinary obstructions and spherical fibrations

โœ Scribed by C. Bohr

Publisher
Springer
Year
2002
Tongue
English
Weight
89 KB
Volume
78
Category
Article
ISSN
0003-889X

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๐Ÿ“œ SIMILAR VOLUMES

On the relation between lifting obstruct
On the relation between lifting obstructions and ordinary obstructions
โœ Christian Bohr ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 95 KB

We consider partial liftings k : A โ†’ E of maps f : X โ†’ B, where (X, A) is a relative CW-complex and E โ†’ B is a fibration. In this situation, we have a primary obstruction to extend the partial lifting to a lifting of f on all of X, and there is an obstruction to extend k as an ordinary map into the

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โœ Stephan Foldes; Ivan Rival; Jorge Urrutia ๐Ÿ“‚ Article ๐Ÿ“… 1992 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 639 KB

Ordered sets are used as a computational model for motion planning in which figures on the plane may be moved along a ray emanating from a light source. The resulting obstructions give rise to ordered sets which, in turn, are precisely the (truncated) spherical orders. We show too, that there is a l