Types of almost continuity

Author:

Garrett B. D.,Kellum K. R.

Abstract

The differences for properties of the range space f ( X ) f(X) are considered for functions f : X Y f:X \to Y , where f f is almost continuous relative to X × Z X \times Z , and f ( X ) Z Y f(X) \subset Z \subset Y . It is shown that if f f is allowed to be almost continuous relative to X × Z X \times Z , where X X is a Peano continuum and Z Z is a locally connected metric space, then f ( X ) f(X) can be any type of subcontinuum of Z Z . This contrasts the known results for the case where Z = f ( X ) Z = f(X) and almost continuity is relative to X × f ( X ) X \times f(X) . Outer almost continuous retracts ( f : X X f:X \to X is almost continuous relative to X × X X \times X ) and inner almost continuous retracts ( f : X X f:X \to X is almost continuous relative to X × f ( X ) ) X \times f(X)) ) are defined. Properties of outer almost continuous retracts, including the existence of an outer almost continuous retract M M of a fixed point space X X , where M M does not have the fixed point property, are found.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference8 articles.

1. Almost continuous retracts;Garrett, B. D.,1981

2. Non-continuous retracts;Kellum, Kenneth R.,1975

3. On a question of Borsuk concerning non-continuous retracts. I;Kellum, Kenneth R.;Fund. Math.,1975

4. On a question of Borsuk concerning non-continuous retracts. II;Kellum, Kenneth R.;Fund. Math.,1976

5. The equivalence of absolute almost continuous retracts and 𝜖-absolute retracts;Kellum, Kenneth R.;Fund. Math.,1977

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. The axiom of choice and almost continuity;Topology and its Applications;1988-07

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