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2 votes
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Is a mixture of $\ell_p$-norms $\eta(x):=\lVert x\rVert_2 + r\lVert x\rVert_p$ always dimens...

\end{array} In other words, the norms $\eta$ and $\|\cdot\|_q$ are equivalent on the real vector space $c_{00}$ of finitely supported sequences (i.e. real sequences with only finitely many nonzero terms …
Jack L.'s user avatar
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11 votes
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Subtracting the weak limit reduces the norm in the limit

The property you indicate is known as (strict) Opial’s Property (see https://en.m.wikipedia.org/wiki/Opial_property). It fails generally in reflexive spaces; in fact, it fails generally even for unifo …
Jack L.'s user avatar
  • 1,453