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  3. 1 let u be the oneighborhood of x1 and...

Question: 1 let u be the oneighborhood of x1 and...

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1: : Let U, be the o-neighborhood of x1 and U2 the ö-neighborhood of x2. Show that U, n U2 is empty if and only if o s x x2Show that the half space {x : z . x < c} is an open set. [Hint: Iz . y-z.xl b: Izlly-xl.]

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