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Document Type

Research

Abstract

Given a topological space in which the operation of closure of a set, here denoted by 'e', has the properties: e (A+B) = eA+eB; A is a subset of eA, eO = 0, e2A = eA (where A is any subset of the space and 0 is the null set), we may define the interior 'i' of a set A by the formula iA = cecA (where cA denotes the complement of A in the space) and write a formula entirely equivalent to one due to C. Kuratowski (Fundamenta Mathematicae, III (1922), p. 183) in the following way: (1) (ei)2A = eiA.

Publication Date

1941

Journal Title

Proceedings of the Iowa Academy of Science

Volume

48

Issue

1

First Page

299

Last Page

300

Copyright

© Copyright 1941 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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