Induced universal maps and some hyperspaces with the fixed point property

Author:

Nadler Sam B.

Abstract

For a (metric) continuum Z Z , let 2 Z {2^Z} (resp., C ( Z ) C(Z) ) denote the space of all nonempty compacta (resp., continua) in Z Z with the Hausdorff metric. We prove: (1) If f f is a monotone map of a continuum X X onto a Peano continuum Y Y , then, for any maps g : 2 X 2 Y g:{2^X} \to {2^Y} and h : C ( X ) C ( Y ) h:C(X) \to C(Y) , there is A 2 X A \in {2^X} and B C ( X ) B \in C(X) such that f ( A ) = g ( A ) f(A) = g(A) and f ( B ) = h ( B ) f(B) = h(B) . We use (1) to prove: (2) If X X is an inverse limit of dendrites with quasi-monotone bonding maps, then 2 X {2^X} and C ( X ) C(X) have the fixed point property. Thus, we have a proof that for certain indecomposable continua X , 2 X X,{2^X} has the fixed point property.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

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