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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

1 vote

Bounding supremum norm of Lipschitz function by L1 norm

I give a proof that gives tighter sup-norm bounds when you have control of the $L^2$ norm (or $L^q$ norm more generally). The following proof should also be generalizable to general Holder classes (e. …
Lars's user avatar
  • 625
6 votes
Accepted

Convergence criterion in the domain of an unbounded operator

If you have a uniform upper bound on $\|Ax_n\|$ then you can extract a weakly convergent subsequence $Ax_{n_k}$. Denote $\lim_n Ax_{n_k} = y_{\infty}$ to be the weak limit. Since $A$ is closed, it is …
Lars's user avatar
  • 625