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Two-point Pade approximants for Stieltjes functions and their application to composite materials

Tokarzewski S., Telega J. J.

Applied Mathematics and Computer Science

1998

Vol. 8, no 2

417-434

By employing special continued fractions to asymptotic expansions at zero and infinity, the convergence of the balanced and unbalanced two-point Pade approximants (2PPA) to a Stieltjes function is studied in a real domain. We prove that certain balanced and unbalanced two-point Pade approximants form a monotone sequence of upper and lower bounds uniformly converging to a Stieltjes function. The observed monotone and uniform convergence of 2PPA is exemplified in the evaluation of bounds on the effective transport coefficients of periodic inhomogeneous media.