Question: I don't get this real analysis problem. 19.M. If X = (Xmm) is a convergent double sequence of real numbers, and if for each m

I don't get this real analysis problem.

19.M. If X = (Xmm) is a convergent double sequence of real numbers, and if for each m E N, the limit ym = lim sup, (Xmm) exists, then we have limm. (Xmm) = lim. (ym)

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