Orlicz property of operator spaces and eigenvalue estimates

Details Orlicz property of operator spaces and eigenvalue estimates Orlicz property of operator spaces and eigenvalue estimates

1994-04-14

arxiv.org/abs/math/9404210v1

Mathematics

Functional Analysis

Scientific paper

As is well known absolute convergence and unconditional convergence for series are equivalent only in finite dimensional Banach spaces. Replacing the classical notion of absolutely summing operators by the notion of 1 summing operators \[ \summ_k || Tx_k || \leq c || \summ_k e_k \otimes x_k ||_{\ell_1\otimes_{min}E}\] in the category of operator spaces, it turns out that there are quite different interesting examples of 1 summing operator spaces. Moreover, the eigenvalues of a composition $TS$ decreases of order $n^{\frac{1}{q}}$ for all operators $S$ factorizing completely through a commutative $C^*$-algebra if and only if the 1 summing norm of the operator $T$ restricted to a $n$-dimensional subspace is not larger than $c n^{1-\frac{1}{q}}$, provided $q>2$. This notion of 1 summing operators is closely connected to the notion of minimal and maximal operator spaces.

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