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An algorithm for division of powerseries

Ein Algorithmus für Potenzreihendivision

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Abstract

An algorithm is given to compute a solution (b 0, ...,b n) of

$$\sum\limits_0^n {a_i t^i } \sum\limits_0^n {b_i t^i } \equiv \sum\limits_0^n {c_i t^i } (t^{n + 1} )$$

froma 0, ..., an, c0, ..., cn. It needs less than 7n multiplications, where multiplications with a skalar from an infinite subfield are not counted.

Zusammenfassung

Es wird ein Verfahren angegeben, eine Lösung (b 0, ..., bn) von

$$\sum\limits_0^n {a_i t^i } \sum\limits_0^n {b_i t^i } \equiv \sum\limits_0^n {c_i t^i } (t^{n + 1} )$$

ausa 0, ..., an, b0, ..., bn zu berechnen. Es braucht weniger als 7n Multiplikationen, wobei Multiplikationen mit Elementen aus einem unendlichen Unterkörper nicht gezählt werden.

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References

  1. Strassen, V.: Berechnung und Programm. (To appear in Acta Informatica.)

  2. Strassen, V.: Vermeidung von Divisionen. (To appear in Crelle Journal.)

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Sieveking, M. An algorithm for division of powerseries. Computing 10, 153–156 (1972). https://doi.org/10.1007/BF02242389

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  • DOI: https://doi.org/10.1007/BF02242389

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