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Read e-book online Topological Fixed Point Theory of Multivalued Mappings PDF

By Lech Górniewicz

ISBN-10: 9401591954

ISBN-13: 9789401591959

ISBN-10: 9401591970

ISBN-13: 9789401591973

This publication is dedicated to the topological mounted element concept of multivalued mappings together with purposes to differential inclusions and mathematical economic system. it's the first monograph facing the mounted element thought of multivalued mappings in metric ANR areas. even though the theoretical fabric was once tendentiously chosen with recognize to functions, the textual content is self-contained. present effects are presented.

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Extra resources for Topological Fixed Point Theory of Multivalued Mappings

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By E will be denoted the subcategory of £ consisting of all compact pairs and maps of such pairs. For maps of pairs we can consider also the notion of homotopy. Namely, two maps j, 9 : (X, Xo) --+ (Y, Yo) are said to be homotopic (written j '" g) provided that there is a map h : (X x [0,1]' Xo x [0,1]) --+ (Y, Yo) such that h(x, 0) = f(x) and h(x, 1) = g(x) for every x E X. Let us observe that if (X,Xo) is a pair in E, then (X x [0,1]' Xo x [0,1]) is in Etoo. Below we recall some basic facts concerning the Cech homology (cohomology) functor.

Since A is closed we have yEA but f is continuous so f(y) = x E f(A) and the proof is completed. 1) is not true. As we already known a space X is closed acyclic provided: (i) Hq(X) (ii) Ho(X) = 0 for all q ~ 1, and >:::, Q. In other words a space X is acyclic if its homology are exactly the same as the homology of a one point space {p}. An equivalent definition of acyclic spaces is the following: a space X is acyclic if and only if the map j : {p} -t X, j (p) = Xo EX, induces an isomorphism j. (X).

J=l Now, we define fE : X ----t J U by putting k fE(X) = I>i(X) . Yi· i=1 Let En(E) be a subspace of E spannded by vectors Y1, ... , En(e) Then fe(X) c conv{Y1, ... = span{Y1, ... , yd. , Yn} so fE is a compact map. We have: k IIf(x) - fE(X)11 ~ LfJi(X)llf(x) i=1 Yill < c:.

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Topological Fixed Point Theory of Multivalued Mappings by Lech Górniewicz


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