Let, μ be a signed measure, and
denote the total measure of its positive and negative parts by P and N. Since the
total variation of such a measure is V = P + |N|, and the maximum of the absolute
value of the measure is M = max(P,|N|), we have the inequality M ≦ V ≦ 2M. We
consider the following question.
What should replace the constant 2 in this inequality when we pass to
higher-dimensional vecstor-valued measures?
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