On free resolutions in multivariable operator theory

Details On free resolutions in multivariable operator theory On free resolutions in multivariable operator theory

2001-09-17

arxiv.org/abs/math/0109111v2

Mathematics

Functional Analysis

23 pages

Scientific paper

We define the notion of a free resolution of a d-tuple $(T_1, T_2, . . . T_d)$ of mutually commuting operators acting on a Hilbert space H, and that this invariant gives rise to a class of vector space complexes parametrized by points in the unit ball $B_d = {z \in C^d: |z| <1}$. We show that for $\lambda \in B_d$ the homology of the corresponding complex is equivalent to the homology of the Koszul complex of a Mobius transform of $(T_1, T_2, . . . T_d)$. The notion of a Mobius transform in multivariable operator is defined, and some of its properties are investigated.

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