On elementary integrability of rational vector fields

arXiv (Cornell University)

Abstract

We consider complex rational vector fields that admit a first integral whose logarithmic derivative lies in a finite extension of the rational function field $K$. In view of the Prelle-Singer theorem, these are the rational vector fields that admit an elementary first integral. Elementary integrable vector fields which are not Darboux integrable -- thus the extension field is necessarily a proper extension of $K$ -- may be called exceptional by an observation in an earlier paper by Christopher et al. For dimension two we characterize all possible algebraic extension fields underlying the exceptional cases, provide a construction of all exceptional vector fields, and obtain some criteria that restrict the degree of $L$.

Authors 2

1. Colin J. Christopher

   University of Plymouth

   Affiliation as printed

   School of Engineering , Computing and Mathematics Plymouth University Plymouth , PL4 8AA , UK

2. Sebastian Walcher Aachen Fachgruppe Mathematik

   RWTH Aachen University

   Affiliation as printed

   Fachgruppe Mathematik , RWTH Aachen 52056 Aachen , Germany