4. (a) First prove that infk>n Xk +infk>n Yk ~ infk>n(xk +Yk). (c) By (b), the first...

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4.

(a) First prove that infk>n Xk +infk>n Yk ~ infk>n(xk +Yk).

(c) By (b), the first and final inequalities ca;;- only be st~ict if neithe~ {xn} nor {Yn} converges.

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