The Word Problem for Omega-Terms over the Trotter-Weil Hierarchy
The Word Problem for Omega-Terms over the Trotter-Weil Hierarchy
复制标题
Trotter-Weil 层级上的 Omega 项的文字问题
DOI:
10.1007/s00224-017-9763-z
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发表时间:
2018
影响因子:
0.5
通讯作者:
J. P. Wächter
中科院分区:
文献类型:
--
作者:
M. Kufleitner;J. P. Wächter
For two givenω-termsαandβ, the word problem forω-terms over a varietyVasks whetherα=βin all monoids inV. We show that the word problem forω-terms over each level of the Trotter-Weil Hierarchy is decidable. More precisely, for every fixed variety in the Trotter-Weil Hierarchy, our approach yields an algorithm in nondeterministic logarithmic space (NL). In addition, we provide deterministic polynomial time algorithms which are more efficient than straightforward translations of the NL-algorithms. As an application of our results, we show that separability by the so-called corners of the Trotter-Weil Hierarchy is witnessed byω-terms (this property is also known asω-reducibility). In particular, the separation problem for the corners of the Trotter-Weil Hierarchy is decidable.
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