Saturday, 29 June 2019

limits - Sequence of norms

Suppose that we have a sequence of norms (n)n1 on a finite dimensional space X such that, as functions from X to R+, they point-wise converge to a limit norm . Since we are in a finite-dimensional setting, all of the norms are equivalent among them, and, in particular, all of the norms in the sequence are equivalent to . An implication of this fact is that there is a sequence of constants cn such that
n1,xX,xncnx.



Now, the equivalence constants cn are not necessarily unique, but, since the norms n approach in the limit, I am wondering how can one prove that they can be chosen to have 1 as a limit (i.e. lim) ?

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