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Pseudospectral Shattering, the Sign Function, and Diagonalization in Nearly Matrix Multiplication Time

Pseudospectral Shattering, the Sign Function, and Diagonalization in Nearly Matrix Multiplication Time

We exhibit a randomized algorithm which given a square matrix A ∈ \mathbbC <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n×n</sup> with ||A|| ≤ 1 and , computes with high probability an invertible V and diagonal D such that ||A-VDV <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> || ≤ δ in O(TMM(n)log <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (n/δ)) arithmetic operations on …