## Chinese Journal of Numerical Mathematics and Applications |

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### Contents

Sun Jiguang Gerschgorin type theorem and the perturbation of | 1 |

Cai DaYong Block iteration for solving large sparse leastsquares | 14 |

Liang Guoping A FEM with changing grid | 28 |

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Academia Sinica analysis Appl Applied approximation Beijing boundary condition calculate Chinese coefficients Comp complexity computing amount constant continued fraction coordinate system defined denote determine the DOF difference schemes discrete discrete Hartley transform DOF of nodes domain eigenvalues error estimates Euler spline example exists finite element method Fourier function Galerkin methods given grid Hartley transform Hence initial values integral interpolation interval inverse iterative method Lemma linear multistep formulas linear recurrence major elements Math mesh multiplication Newton's iteration nodal nonlinear numerical method obtain optimal ordinary differential equations paper parallel algorithm parallel steps parameters polynomial PROOF QD table quasi-Newton methods respectively RLI(N satisfy sequence solution solving sorting method stability condition Strassen algorithm structure Substituting symmetric Theorem triangulation unique unit pseudo-load value problem vector zero Zhang