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The Orbit Problem Is in the GapL Hierarchy

V. Arvind1 and T. C. Vijayaraghavan2

(1)  The Institute of Mathematical Sciences, Chennai, 600 113, India
(2)  Chennai Mathematical Institute, SIPCOT IT Park Padur PO, Siruseri, 603 103, India
Abstract
The Orbit problem is defined as follows: Given a matrix A ε n×n and vectors x,y ∈ ℚ n , does there exist a non-negative integer i such that A i x = y. This problem was shown to be in deterministic polynomial time by Kannan and Lipton in [7]. In this paper we put the problem in the logspace counting hierarchy GapLH. We also show that the problem is hard for C=L.

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