= Drazin inverse
{wiki=Drazin_inverse}
The Drazin inverse is a generalization of the concept of an inverse matrix in linear algebra. It is particularly useful for dealing with matrices that are not invertible in the conventional sense, especially in the context of singular matrices or matrices with a certain structure. Given a square matrix \\( A \\), the Drazin inverse, denoted \\( A^D \\), is defined when the matrix \\( A \\) satisfies certain conditions regarding its eigenvalues and nilpotent parts.
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