Let (f=(g, h):[0, infty) ightarrow mathbb{R}^{2}) and (p>0). Show that (operatorname{VAR}_{p}(f ;[0, t])

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Let \(f=(g, h):[0, \infty) ightarrow \mathbb{R}^{2}\) and \(p>0\). Show that \(\operatorname{VAR}_{p}(f ;[0, t])<\infty\) if, and only if, \(\operatorname{VAR}_{p}(g ;[0, t])+\operatorname{VAR}_{p}(h ;[0, t])<\infty\).

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