O ct 2 00 1 SOME NEW FORMULAS FOR π

نویسندگان

  • Gert Almkvist
  • Christian Krattenthaler
چکیده

Matematiska Institutionen, Lunds Universitet, SE-221 00 Lund, Sweden. E-mail: [email protected], [email protected] Institut für Mathematik der Universität Wien, Strudlhofgasse 4, A-1090 Wien, Austria. E-mail: [email protected] WWW: http://www.mat.univie.ac.at/~kratt Abstract. We show how to find arbitrarily fast convergent series expansions for π of the form π = ∑∞ n=0 S(n) /( mn pn ) a, where S(n) is some polynomial in n (depending on m, p, a). We prove that there exist such expansions for m = 8k, p = 4k, a = (−4), for any k, and give explicit examples for such expansions for small values of m, p and a.

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تاریخ انتشار 2001