“…The fuzzy set theoretical and fuzzy topological concepts used in this paper are standard and can be found in Zadeh [32], Klir and Yuah [18], Chang [6], Belohlavek [2], Lowen [19] and Pu and Liu [28]. However, we feel it necessary to fix some notions and recall a few concepts from [2], [6], [17], [18], [20], [28], [30], [32].…”