Decidability of membership problems for flat rational subsets of GL(2, Q) and singular matrices
Decidability of membership problems for flat rational subsets of GL(2, Q) and singular matrices
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GL(2, Q) 和奇异矩阵的平有理子集隶属问题的可判定性
DOI:
10.1145/3373207.3404038
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Diekert V
中科院分区:
文献类型:
--
作者:
Diekert V
This work relates numerical problems on matrices over the rationals to symbolic algorithms on words and finite automata. Using exact algebraic algorithms and symbolic computation, we prove new decidability results for 2 × 2 matrices over Q. Namely, we introduce a notion offlat rational sets: ifMis a monoid andN≤Mis its submonoid, then flat rational sets ofMrelative toNare finite unions of the formL0g1L1···gtLtwhere allLis are rational subsets ofNandgi∈M.We give quite general sufficient conditions under which flat rational sets form an effective relative Boolean algebra. As a corollary, we obtain that the emptiness problem for Boolean combinations of flat rational subsets of GL(2, Q) over GL(2, Z) is decidable.We also show a dichotomy for nontrivial group extension of GL(2, Z) in GL(2, Q): ifGis a f.g. group such that GL(2, Z) <G≤ GL(2, Q), then eitherG≅ GL(2, Z) × Zk, for somek≥ 1, orGcontains an extension of the Baumslag-Solitar group BS(1,q), withq≥ 2, of infinite index. It turns out that in the first case the membership problem forGis decidable but the equality problem for rational subsets ofGis undecidable. In the second case, decidability of the membership problem is open for every suchG.In the last section we prove new decidability results for flat rational sets that contain singular matrices. In particular, we show that the membership problem is decidable for flat rational subsets ofM(2, Q) relative to the submonoid that is generated by the matrices fromM(2, Z) with determinants 0, ± 1 and the central rational matrices.
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DOI:
--
发表时间:
1969
期刊:
Canadian Journal of Mathematics - Journal Canadien de Mathematiques
影响因子:
--
作者:
H. Zassenhaus
通讯作者:
H. Zassenhaus
DOI:
--
发表时间:
2019
期刊:
International Conference on Concurrency Theory
影响因子:
--
作者:
A. Finkel;M. Praveen
通讯作者:
M. Praveen
DOI:
--
发表时间:
1992
期刊:
Latin American Symposium on Theoretical Informatics
影响因子:
--
作者:
J. Sakarovitch
通讯作者:
J. Sakarovitch
DOI:
10.2307/j.ctvc77m52.72
发表时间:
2019
期刊:
99 Variations on a Proof
影响因子:
--
作者:
Y. Lafont
通讯作者:
Y. Lafont
影响因子:
0.8
作者:
V. Diekert;M. Elder
通讯作者:
M. Elder