Independence of Hyperlogarithms over Function Fields via Algebraic Combinatorics

@inproceedings{Deneufchtel2011IndependenceOH,
  title={Independence of Hyperlogarithms over Function Fields via Algebraic Combinatorics},
  author={Matthieu Deneufch{\^a}tel and G{\'e}rard H. E. Duchamp and Vincel Hoang Ngoc Minh and Allan I. Solomon},
  booktitle={CAI},
  year={2011}
}
We obtain a necessary and sufficient condition for the linear independence of solutions of differential equations for hyperlogarithms. The key fact is that the multiplier (i.e. the factor M in the differential equation dS = MS) has only singularities of first order (Fuchsian-type equations) and this implies that they freely span a space which contains no primitive. We give direct applications where we extend the property of linear independence to the largest known ring of coefficients. 
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