Show that over $W^{m,p}(a,b)$ the norms
$$||w||^p_{W^{m,p}(a,b)} = \sum_{i=1}^m\int_a^b|w^{(i)}|^pdx$$
$$||w||^p_{W} = \int_a^b|w|^pdx + \int_a^b|w^{(m)}|^pdx$$
are equivalents.
pdta: By $w^{(j)}$ we denoting the j-ésima derivate of $w$.
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