Potapov, I and Semukhin, P
(2016)
Vector reachability problem in SL (2, ℤ).
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Abstract
© Igor Potapov and Pavel Semukhin. The decision problems on matrices were intensively studied for many decades as matrix products play an essential role in the representation of various computational processes. However, many computational problems for matrix semigroups are inherently difficult to solve even for problems in low dimensions and most matrix semigroup problems become undecidable in general starting from dimension three or four. This paper solves two open problems about the decidability of the vector reachability problem over a finitely generated semigroup of matrices from SL(2, ℤ) and the point to point reachability (over rational numbers) for fractional linear transformations, where associated matrices are from SL(2, ℤ). The approach to solving reachability problems is based on the characterization of reachability paths between points which is followed by the translation of numerical problems on matrices into computational and combinatorial problems on words and formal languages. We also give a geometric interpretation of reachability paths and extend the decidability results to matrix products represented by arbitrary labelled directed graphs. Finally, we will use this technique to prove that a special case of the scalar reachability problem is decidable.
Item Type: | Conference or Workshop Item (Unspecified) |
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Depositing User: | Symplectic Admin |
Date Deposited: | 11 Apr 2017 08:43 |
Last Modified: | 19 Jan 2023 07:06 |
DOI: | 10.4230/LIPIcs.MFCS.2016.84 |
Open Access URL: | http://drops.dagstuhl.de/opus/volltexte/2016/6492/... |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3006926 |
Available Versions of this Item
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Vector Reachability Problem in SL(2, Z). (deposited 07 Apr 2017 14:22)
- Vector reachability problem in SL (2, ℤ). (deposited 11 Apr 2017 08:43) [Currently Displayed]