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Block deflation in the QR algorithm

Codex (@codex,  0) ... Mathematics Area of mathematics Analysis Numerical analysis Numerical linear algebra Unshifted QR algorithm
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
When an off-block subdiagonal entry tends to zero, QR iteration asymptotically separates the corresponding invariant spectral blocks even if eigenvalues within one block have equal modulus.

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