Two-way Automata and Regular Languages of Overlapping Tiles

被引:0
作者
Dicky, Anne [1 ]
Janin, David [1 ]
机构
[1] Univ Bordeaux, LaBRI UMR 5800, F-33405 Talence, France
关键词
two-way automata; word languages; overlapping tile languages; regular languages; McAlister inverse monoid; INVERSE; REDUCTION;
D O I
10.3233/FI-2015-1278
中图分类号
TP31 [计算机软件];
学科分类号
081202 ; 0835 ;
摘要
We consider classes of languages of overlapping tiles, i.e., subsets of the McAlister monoid: the class REG of languages definable by Kleene's regular expressions, the class MSO of languages definable by formulas of monadic second-order logic, and the class REC of languages definable by morphisms into finite monoids. By extending the semantics of finite-state two-way automata (possibly with pebbles) from languages of words to languages of tiles, we obtain a complete characterization of the classes REG and MSO. In particular, we show that adding pebbles strictly increases the expressive power of two-way automata recognizing languages of tiles, but the hierarchy induced by the number of allowed pebbles collapses to level one.
引用
收藏
页码:310 / 342
页数:33
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