Let x be any set then the indiscrete topolagy ■ is coarser that any topology I defined on x- 5 Let x be any set then the discrete topology is finer that any topology I defined on x. التاريخ الموضوع : let R be used of real numbers then the usual topology on R finer that cofinite topology on R Let IN be aset of natural numbers then the Cofinite topology on (I) finer than final segment. on IN. (c

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