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Abstract

In [4], Császár has introduced the notions of weak structures and the structures α(w), π(w), σ(w), β(w). The main aim of this paper is to introduce and study properties of the structures r(w), α(w), π(w), σ(w) and β(w).

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Abstract

We define weak structures and show that these structures can replace in many situations generalized topologies or minimal structures.

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