On reachability problems for low dimensional matrix semigroups
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We consider the Membership and the Half-space Reachability Problems for matrices in dimensions two and three. Our first main result is that the Membership Problem is decidable for fintely generated sub-semigroups of the Heisenberg group over integer numbers. Furthermore, we prove two decidability results for the Half-space reachability problem. Namely, we show that this problem is decidable for sub-semigroups of GL(2,Z) and of the Heisenberg group over rational numbers.
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