Detecting real singularities of a space curve from a real rational parametrization

  • Authors:
  • R. Rubio;J. M. Serradilla;M. P. Vélez

  • Affiliations:
  • Escuela Politécnica Superior, Universidad Antonio de Nebrija, Madrid, Spain;Escuela Politécnica Superior, Universidad Antonio de Nebrija, Madrid, Spain;Escuela Politécnica Superior, Universidad Antonio de Nebrija, Madrid, Spain

  • Venue:
  • Journal of Symbolic Computation
  • Year:
  • 2009

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Abstract

In this paper we give an algorithm that detects real singularities, including singularities at infinity, and counts local branches and multiplicities of real rational curves in the affine n-space without knowing an implicitization. The main idea behind this is a generalization of the D-resultant (see [van den Essen, A., Yu, J.-T., 1997. The D-resultant, singularities and the degree of unfaithfulness. Proc. Amer. Math. Soc. 25 (3), 689-695]) to n rational functions. This allows us to find all real parameters corresponding to the real singularities between the solutions of a system of polynomials in one variable.