The continuous Skolem-Pisot problem

  title={The continuous Skolem-Pisot problem},
  author={Paul Bell and Jean-Charles Delvenne and Rapha{\"e}l M. Jungers and Vincent D. Blondel},
  journal={Theor. Comput. Sci.},
We study decidability and complexity questions related to a continuous analogue of the Skolem-Pisot problem concerning the zeros and nonnegativity of a linear recurrent sequence. In particular, we show that the continuous version of the nonnegativity problem is NP-hard in general and we show that the presence of a zero is decidable for several subcases, including instances of depth two or less, although the decidability in general is left open. The problems may also be stated as reachability… CONTINUE READING
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