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Results tagged with matrices
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user 510409
Questions where the notion matrix has an important or crucial role (for the latter, note the tag matrix-theory for potential use). Matrices appear in various parts of mathematics, and this tag is typically combined with other tags to make the general subject clear, such as an appropriate top-level tag ra.rings-and-algebras, co.combinatorics, etc. and other tags that might be applicable. There are also several more specialized tags concerning matrices.
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How to compute inverse of sum of a unitary matrix and a full rank diagonal matrix?
You could use Woodbury matrix identity. In your case, this is
$$
(A + D)^{-1} = A^{-1} - A^{-1} (D^{-1} + A^{-1})^{-1} A^{-1}.
$$
You still need to compute $(D^{-1} + A^{-1})^{-1}$, which may not be e …
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