The basic notions of CG-lower and CG-upper approximation in cordial topological space are introduced, which are the core concept of this paper and some of it's properties are studied. Furthermore, we have investigated some results, examples and counter examples are provided by using graphs.

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The aim of this present paper is to introduce a new class of set namely (1,2)-j-open, (1,2)-j-closed in bitopological spaces. We investigate the several properties and study their relationship with other existing sets.