TY - JOUR
AU - Suárez, Jesús
PY - 2024/05/27
Y2 - 2024/07/21
TI - The Kalton-Peck space as a spreading model
JF - MATHEMATICA SCANDINAVICA
JA - Math. Scand.
VL - 130
IS - 2
SE - Articles
DO - 10.7146/math.scand.a-143424
UR - https://www.mscand.dk/article/view/143424
SP -
AB - <p>The so-called Kalton-Peck space $Z_2$ is a twisted Hilbert space induced, using complex interpolation, by $c_0$ or $\ell _p$ for any $1\leq p
eq 2<\infty $. Kalton and Peck developed a scheme of results for $Z_2$ showing that it is a very rigid space. For example, every normalized basic sequence in $Z_2$ contains a subsequence which is equivalent to either the Hilbert copy $\ell _2$ or the Orlicz space $\ell _M$. Recently, new examples of twisted Hilbert spaces, which are induced by asymptotic $\ell _p$-spaces, have appeared on the stage. Thus, our aim is to extend the Kalton-Peck theory of $Z_2$ to twisted Hilbert spaces $Z(X)$ induced by asymptotic $c_0$ or $\ell _p$-spaces $X$ for $1\leq p<\infty $. One of the novelties is to use spreading models to gain information on the isomorphic structure of the subspaces of a twisted Hilbert space. As a sample of our results, the only spreading models of $Z(X)$ are $\ell _2$ and $\ell _M$, whenever $X$ is as above and $p
eq 2$.</p>
ER -