Introduzione
Abstract
En
Given a topological space
and a subset 
of 
, the topology 
is called the simple extension of 
by (see Levine 3).Here we show how to recognize when two subsets and 
of define the same simple extension of and we give a characterization of those expansions of which are simple extensions of by suitable subsets of .
Given a topological space
and a subset of , the topology is called the simple extension of by (see Levine 3).Here we show how to recognize when two subsets and of define the same simple extension of and we give a characterization of those expansions of which are simple extensions of by suitable subsets of .DOI Code:
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