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Could someone please help me with this problem Let SER. Define SO = UEU: USS and U is open? so That S' is The union

Could someone please help me with this problem

Let SER. Define SO = UEU: USS and U is open? so That S' is The union of all open Subsets of S. Prove : 5 is an open subset of S Prove : So is The largest open subset of S by showing That if VES is open, Then VS S

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