Socle theory for Leavitt path algebras of arbitrary graphs

Details Socle theory for Leavitt path algebras of arbitrary graphs Socle theory for Leavitt path algebras of arbitrary graphs

2008-02-08

arxiv.org/abs/0802.1198v1

Mathematics

Rings and Algebras

20 pgs

Scientific paper

The main aim of the paper is to give a socle theory for Leavitt path algebras of arbitrary graphs. We use both the desingularization process and combinatorial methods to study Morita invariant properties concerning the socle and to characterize it, respectively. Leavitt path algebras with nonzero socle are described as those which have line points, and it is shown that the line points generate the socle of a Leavitt path algebra, extending so the results for row-finite graphs in the previous paper [12] (but with different methods). A concrete description of the socle of a Leavitt path algebra is obtained: it is a direct sum of matrix rings (of finite or infinite size) over the base field. New proofs of the Graded Uniqueness and of the Cuntz-Krieger Uniqueness Theorems are given, shorthening significantly the original ones.

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