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arxiv: 1309.1550 · v3 · pith:4B5UIZTPnew · submitted 2013-09-06 · 💻 cs.DM

On the Positivity Problem for Simple Linear Recurrence Sequences

classification 💻 cs.DM
keywords positivitylinearproblemrecurrencesequencesimpleaskscharacteristic
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Given a linear recurrence sequence (LRS) over the integers, the Positivity Problem} asks whether all terms of the sequence are positive. We show that, for simple LRS (those whose characteristic polynomial has no repeated roots) of order 9 or less, Positivity is decidable, with complexity in the Counting Hierarchy.

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