Abstract. New forms of contra-open and contra-closed functions are introduced. These new forms are used to extend several results in the literature. In particular, theorems stating conditions under which contra-open functions are closed and contra-closed functions are open are improved. Relationships between these functions and other related classes of functions are established.

Received: August 12, 2011

AMS Subject Classification: 54C08, 54C10

Key Words and Phrases: contra-open, contra-closed, weakly contra-open, weakly contra-closed

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Source: International Journal of Pure and Applied Mathematics
ISSN printed version: 1311-8080
ISSN on-line version: 1314-3395
Year: 2011
Volume: 73
Issue: 3

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