Relative positions of matroid algebras

Details Relative positions of matroid algebras Relative positions of matroid algebras

1998-08-31

arxiv.org/abs/math/9808131v1

Mathematics

Operator Algebras

28 pages

Scientific paper

A classification is given for (regular) positions of direct sums of two matroid algebras (unital algebraic limits of matrix algebras) in a matroid superalgebra, where the individual summands have index 2 in their associated corner algebra. A similar classification is obtained for positions of direct sums of 2-symmetric algebras and, in the odd case, for the positions of sums of 2-symmetric C*-algebras in matroid C*-algebras. The approach relies on an analysis of intermediate non-self-adjoint operator algebras and the classifications are given in terms of K0 invariants, partial isometry homology and scales in the associated composite K0-homology group.

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