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Results tagged with fa.functional-analysis
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user 469053
Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.
1
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71
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Lipschitz isomorphisms of $C(\omega^\omega+)$
Let $C(\omega^\omega+)$ denote the Banach space of continuous, scalar-valued functions defined on $\omega^\omega+=[0,\omega^\omega]$. Suppose that $X$ is a Banach space and $U:C(\omega^\omega+)\to X$ …
- 81
8
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A geometric intuition about convexifiability
I've come up with the following conjecture about convexifiability being determined by "important" sets in Banach spaces. To me, the conjecture looks quite innocuous and intuitive, but I'm having troub …
- 81
3
votes
Accepted
If $H \in L_{q} (\mu, X^*)$ such that $\int \langle H, f \rangle \mathrm d \mu = 0$ for all ...
It is always true that $L_q(\mu,X^*)\hookrightarrow L_p(\mu,X)^*$ isometrically (without the assumption that $X$ has the Radon-Nikodym property). We need the Radon-Nikodym property to guarantee that t …
- 81
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71
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Multiple steps of the Gorelik principle
The following result is one of several non-linear Banach space theory results known as The Gorelik Principle. I am stating it here in a weaker form than what is in the literature, but the statement he …
- 81
2
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answers
140
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Extracting block sequences from $\ell_p^n$-like sequences in isomorphic copies of $\ell_p$
One of the characterizing properties of the canonical bases of the $\ell_p/c_0$ spaces is their perfect homogeneity (Zippin), so that every normalized block sequence in these spaces behaves like the c …
- 81