Abstract
Abstract For any field K and for a completely arbitrary graph E, we characterize the Leavitt path algebras L K (E) that are indecomposable (as a direct sum of two-sided ideals) in terms of the underlying graph. When the algebra decomposes, it actually does so as a direct sum of Leavitt path algebras for some suitable graphs. Under certain finiteness conditions, a unique indecomposable decomposition exists.
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