Question 6. In a topological space (X,7) a subset ACX is called regular open if A=int(cl(A)) "A= A". Determine whether the family of all regular open sets is closed under arbitrary union or not.

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Q: Question 5. In a topological space (X,7) a subset ACX is called regular open if A=int(cl(A)) "A= A".…

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Q: Question 5. In a topological space (X,t) a subset ACX is called regular open if A=int(cl(A)) "A A".…

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.