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In a number of papers (,  ), Delves and Mead have derived some useful (though limited) rate of convergence results which can be applied to variational approximations for the solution of linear positive definite operator equations when the coordinate system is uniformly asymptotically diagonal. Independently, Mikhlin  has examined the stability of such variational approximations in the case of positive definite operators and concluded that the use of strongly minimal coordinate systemsdoi:10.2307/2005694 fatcat:5slf3yytevdm5f3e7pgo3fz7sm