On multivariate rational function decomposition

  • Authors:
  • Jaime Gutierrez;Rosario Rubio;David Sevilla

  • Affiliations:
  • Dpto de Matemáticas, Estadística y Computación, Universidad de Cantabria, 39071 Santander, Spain;Departamento de Ingeniería, Universidad Antonio de Nebrija, 28040 Madrid, Spain;Dpto de Matemáticas, Estadística y Computación, Universidad de Cantabria, 39071 Santander, Spain

  • Venue:
  • Journal of Symbolic Computation - Computer algebra: Selected papers from ISSAC 2001
  • Year:
  • 2002

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Abstract

In this paper we discuss several notions of decomposition for multivariate rational functions, and we present algorithms for decomposing multivariate rational functions over an arbitrary field. We also provide a very efficient method to decide if a unirational field has transcendence degree one, and in the affirmative case to compute the generator.