Zusammenfassung
Cizek, Zamastil, and Skala [J. Math. Phys. 44, 962-968 (2003)] introduced in connection with the summation of the divergent perturbation expansion of the hydrogen atom in an external magnetic field a new sequence transformation which uses as input data not only the elements of a sequence {s(n)}(n=0)(infinity) of partial sums, but also explicit estimates {omega(n)}(n=0)(infinity) for the ...
Zusammenfassung
Cizek, Zamastil, and Skala [J. Math. Phys. 44, 962-968 (2003)] introduced in connection with the summation of the divergent perturbation expansion of the hydrogen atom in an external magnetic field a new sequence transformation which uses as input data not only the elements of a sequence {s(n)}(n=0)(infinity) of partial sums, but also explicit estimates {omega(n)}(n=0)(infinity) for the truncation errors. The explicit incorporation of the information contained in the truncation error estimates makes this and related transformations potentially much more powerful than, for instance, Pade approximants. Special cases of the new transformation are sequence transformations introduced by Levin [Int. J. Comput. Math. B 3, 371-388 (1973)] and Weniger [Comput. Phys. Rep. 10, 189-371 (1989), Secs. 7-9; Numer. Algor. 3, 477-486 (1992)] and also a variant of Richardson extrapolation [Philos. Trans. R. Soc. London, Ser. A 226, 299-349 (1927)]. The algebraic theory of these transformations-explicit expressions, recurrence formulas, explicit expressions in the case of special remainder estimates, and asymptotic order estimates satisfied by rational approximants to power series-is formulated in terms of hitherto unknown mathematical properties of the new transformation introduced by Cizek, Zamastil, and Skala. This leads to a considerable formal simplification and unification. (C) 2004 American Institute of Physics.
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