THEOREM EMPTY SET AND SET X ARE CLOSED SETS,INTERSECTION OF ANY NUMBER OF CLOSED SET IS CLOSED
HI I AM KAMRAN KHAN WELCOME TO MY YOUTUBE CHANNEL KK MATHEMATICS IN THIS LECTURE I EXPLAIN THEOREM LET (X,T) BE A TOPOLOGICAL SPACE THEN (1) EMPTY SET AND SET X ARE CLOSED SETS (2)INTERSECTION OF ANY NUMBER OF CLOSED SET IS CLOSED (3)UNION OF FINITE NUMBER OF CLOSED SETS IS CLOSED
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THEOREM EMPTY SET AND SET X ARE OPEN SETS,UNION OF ANY NUMBER OF OPEN SETS IS OPEN,
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Theorem: Every Open ball is an open set in metric space full proof in Hindi/Urdu
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