if there is b ∈ R and a natural number k such that ab = ba and a~kba = ak. The smallest natural number k with above property is called the Drazin index of a. About Drazin invertibility
there is "Jacobson's Lemma": 1-ab is Drazin invertible if and only if 1-ba is Drazin invertible. In this paper
using Gr?bner-Shirshov basis method
we compute the Drazin inverse of 1-ba in terms of the Drazin inverse of 1-ab for k = 2.
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references
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