Cubic Laurent Series in Characteristic 2 with Bounded Partial Quotients

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Abstract: There is a theory of continued fractions for Laurent series in x^{-1} with coefficients in a field F. This theory bears a close analogy with classical continued fractions for real numbers with Laurent series playing the role of real numbers and the sum of the terms of non-negative degree in x playing the role of the integral part. In this paper we survey the Laurent series u, with coefficients in a finite extension of gf(2), that satisfy an irreducible equation of the form a_0(x)+ a_1(x)u+a_2(x)u^2 + a_3(x)u^3=0 with a_3 e 0 and where the a_i are polynomials of low degree in x with coefficients in gf(2). We are particularly interested in the cases in which the sequence of partial quotients is bounded (only finitely many distinct partial quotients occur). We find that there are three essentially different cases when the a_i(x) have degree le 1. We also make some empirical observations concerning relations between different Laurent series roots of the same cubic.

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