Linear convergence in the shifted ๐๐
algorithm
Linear convergence in the shifted ๐๐
algorithm
Global and asymptotic convergence properties for the QR algorithm with Francis double shift are established for certain orthogonal similarity classes of <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="4 times 4"> <mml:semantics> <mml:mrow> <mml:mn>4</mml:mn> <mml:mo>ร<!-- ร --></mml:mo> <mml:mn>4</mml:mn> </mml:mrow> <mml:annotation encoding="application/x-tex">4 \times 4</mml:annotation> </mml:semantics> </mml:math> </inline-formula> real matrices. It is shown that in โฆ