040. Contra pre semi- open maps

Math. Journal: Kyungpook Math. Journal, Republic of Korea.  40 (2000), 379-389.
Authors: Caldas, M., and  Baker, C.

Abstract
In this paper we consider a new generalization of an open map, which is called contra pre semi-open and continue the study of contra pre semi-closed maps i.e., the maps whose images of semi-closed sets are semi-open sets. This definitions enables us to obtain conditions under which inverse image of every subset from codomain is sg-closed. At the end of the note a discussion concerning the semi-closed graph Theorem for contra pre semi-open maps is also presented.


 

Filed Under: 1996-2000

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