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QIANG DU, DESHENG WANG, LIYONG ZHU, ON MESH GEOMETRY AND STIFFNESS MATRIX CONDITIONING FOR GENERAL FINITE ELEMENT SPACES, SIAM Journal on Numerical Analysis, Vol. 47, No. 2 (2009), pp. 1421-1444 ...
A general class of iterative methods is introduced for solving symmetric, positive definite linear systems. These methods use two different approximations to the inverse of the matrix of the problem, ...