Applicable Algebra in Engineering, Communication and Computing

, Volume 20, Issue 1, pp 7–32

Looking for the order of a system of arbitrary ordinary differential equations

De investigando ordine systematis æquationibus differentialium vulgarium cujuscunque

DOI: 10.1007/s00200-009-0087-3

Cite this article as:
Ollivier, F. AAECC (2009) 20: 7. doi:10.1007/s00200-009-0087-3


This paper was edited by S. Cohn and C. W. Borchardt from posthumous manuscripts of C. G. J. Jacobi. The various canonical forms that a given system ordinary differential equations may take are considered. Looking for the order of the system, without using a normal form, is reduced to a problem of inequalities: the affectation problem. A new type of formulas, the truncated determinants, is introduced. The non vanishing of this quantity means that the order will be equal to the value H, solution of this inequalities problem, which is obtained by an algorithm similar to Harold Kuhn’s Hungarian method.


Differential algebraOrder of a differential systemJacobi’s boundAssignment problem

Mathematics Subject Classification (2000)


Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.LIX UMR CNRS 7161, CNRS, École polytechniquePalaiseau CEDEXFrance