Let neN. Set 4, = {n,n+1,n+2,..}and 7 = {ø, A,} pen · a) Verify that T is a topology on N. b) Is {1,3,5,7,...} open in t ? c) What are the closed sets in T ? d) What is the interior and closure of {4} and of {2,4,6,8,..} ? %3D SneN ·

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