Write a proof that proves the Union Un an element of natural numbers (-1/n, 2-1/n)=(-1, 2). Also write a proof that proves the intersectionn an element of natural numbers (-1/n, 2-1/n)=[0,1].

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Set Theory

Every field in the present world involves a set. The theory of sets was developed by German mathematician Georg Cantor while working on the “problems of trigonometric series”.