Symmetry and inverse-closedness of matrix algebras and functional calculus for infinite matrices

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DECAY BOUNDS AND ( ) ALGORITHMS FOR APPROXIMATING FUNCTIONS OF SPARSE MATRICES (2007, background): “In the mathematical literature, the decay property has been first noticed for the inverse of banded, symmetric positive definite matrices; the seminal paper is [22], but see also [9, 40, 49, 60, 65].”