Guessing singular dependencies

  • Authors:
  • Joris Van Der Hoeven

  • Affiliations:
  • -

  • Venue:
  • Journal of Symbolic Computation
  • Year:
  • 2013

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Abstract

Given d complex numbers z"1,...,z"d, it is classical that linear dependencies @l"1z"1+...+@l"dz"d=0 with @l"1,...,@l"d@?Z can be guessed using the LLL-algorithm. Similarly, given d formal power series f"1,...,f"d@?C[[z]], algorithms for computing Pade-Hermite forms provide a way to guess relations P"1f"1+...+P"df"d=0 with P"1,...,P"d@?C[z]. Assuming that f"1,...,f"d have a radius of convergence r0 and given a real number Rr, we will describe a new algorithm for guessing linear dependencies of the form g"1f"1+...+g"df"d=h, where g"1,...,g"d,h@?C[[z]] have a radius of convergence =R. We will also present two alternative algorithms for the special cases of algebraic and Fuchsian dependencies.