Conditions under which disks are -liftable

Author:
Edythe P. Woodruff

Journal:
Trans. Amer. Math. Soc. **186** (1973), 403-418

MSC:
Primary 57A10; Secondary 54B15

MathSciNet review:
0328943

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Abstract: A generalization of the concept of lifting of an *n*-cell is studied. In the usual upper semicontinuous decomposition terminology, let *S* be a space, be the decomposition space, and the projection mapping be . A set is said to be a *P*-lift of a set if is homeomorphic to *X* and is *X*.

Examples are given in which the union of two *P*-liftable sets does not *P*-lift. We prove that if compact 2-manifolds *A* and *B* each *P*-lift, their union is a disk in , their intersection misses the singular points of the projection mapping, and the intersection of the singular points with the union of *A* and *B* is a 0-dimensional set, then the union of *A* and *B* does *P*-lift.

Even if a disk *D* does not *P*-lift, it is proven that for there is a *P*-liftable disk -homeomorphic to *D*, provided that the given decomposition of is either definable by 3-cells, or the set of nondegenerate elements is countable and is homeomorphic to . With further restrictions on the decomposition, this *P*-liftable disk can be chosen in such a manner that it agrees with *D* on the singular points of *D*.

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DOI:
http://dx.doi.org/10.1090/S0002-9947-1973-0328943-6

Keywords:
Decomposition space,
topology of ,
lift of a space,
*P*-lift,
monotone decomposition,
cellular decomposition,
decomposition definable by 3-cells,
tame,
neighborhoods of submanifolds

Article copyright:
© Copyright 1973
American Mathematical Society