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Continued fractions for certain algebraic power series. (English) Zbl 0591.10021
This paper is concerned with the theory of continued fractions over $$\mathbb F_ p((x^{-1}))$$ (the field of formal Laurent series in $$x^{-1}$$ over the field with $$p$$ elements) the polynomials in $$x$$ playing the role of the integers. Improving and generalizing results of L. E. Baum and M. M. Sweet [Ann. Math. (2) 103, 593–610 (1976; Zbl 0312.10024)] about the unique root $$f$$ in $$\mathbb F_ 2((x^{-1}))$$ of the cubic equation $$f=-x/(xf^ 2+1),$$ the authors give some examples of elements of $$\mathbb F_ p((x^{-1})),$$ algebraic over $$\mathbb F_ p(x)$$, for which the degrees of the partial quotients are bounded (in all the examples they are linear). For all examples, including the Baum-Sweet one, the continued fraction expansion is explicitly given. All calculations are based on a process that allows to obtain the continued fraction expansion of $$(Rf^ p+S)/(Tf^ p+U)$$ from that of $$f$$ when $$R, S, T$$ and $$U$$ are polynomials.

##### MSC:
 11J70 Continued fractions and generalizations 11J61 Approximation in non-Archimedean valuations 11T55 Arithmetic theory of polynomial rings over finite fields
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##### References:
 [1] Baum, L.E; Sweet, M.M, Continued fractions of algebraic power series in characteristic 2, Ann. of math., 103, 593-610, (1976) · Zbl 0312.10024 [2] Baum, L.E; Sweet, M.M, Badly approximable power series in characteristic 2, Ann. of math., 105, 573-580, (1977) · Zbl 0352.10017 [3] Beynon, W.M, A formal account of some elementary continued fraction algorithms, J. algorithms, 4, 221-240, (1983) · Zbl 0522.68038 [4] Raney, G.N, On continued fractions and finite automata, Math. ann., 206, 265-283, (1973) · Zbl 0251.10024
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