《山东大学学报(理学版)》 ›› 2024, Vol. 59 ›› Issue (6): 91-97, 107.doi: 10.6040/j.issn.1671-9352.0.2023.044
摘要:
研究了有限字母表Σ上所有严格单缀语言形成的语言类。证明该语言类中的成员是自由半群Σ+上某一偏序关系的独立集;利用这一偏序关系和相关语言的组合性质,定义语言类上的2个二元运算使之成为半环代数;最后阐明该半环是一个ai半环类的自由对象的模型。
中图分类号:
1 | BERSTEL J , PERRIN D , REUTENAUER C . Codes and automata[M]. Cambridge: Cambridge University Press, 2010. |
2 |
KUŘIL M , POLÁK L . On varieties of semilattice-ordered semigroups[J]. Semigroup Forum, 2005, 71 (1): 27- 48.
doi: 10.1007/s00233-004-0176-3 |
3 |
ITO M , JÜRGENSEN H , SHYR H J . Outfix and infix codes and related classes of languages[J]. Journal of Computer and System Science, 1991, 43 (3): 484- 508.
doi: 10.1016/0022-0000(91)90026-2 |
4 |
SHYR H J , THIERRIN G . Hypercodes[J]. Information and Control, 1974, 24 (1): 45- 54.
doi: 10.1016/S0019-9958(74)80022-7 |
5 | SHYR H J, THIERRIN G. Codes and binary relations[C]//1975—1976 Seminaire d'Algebre Paul Dubreil, Berlin: Springer, 1977: 180-188. |
6 | THIERRIN G. Convex languages[M]//LEPISTÖ T, SALOMAA A. Automata, languages, and programming. Berlin: Springer, 1973: 481-492. |
7 | WANG Z , LIANG F , HE Y , et al. Semiring structures of some classes of hypercodes[J]. Journal of Automata and Languages Combinatorics, 2009, 14 (3/4): 259- 272. |
8 | REN M M , ZHAO X Z . On free Burnside ai-semirings[J]. Semigroup Forum, 2015, 90 (1): 171- 184. |
9 | REN M M , ZHAO X Z . The variety of semilattice-ordered semigroups satisfying x3≈x and xy≈yx[J]. Periodica Mathematica Hungarica, 2016, 72 (1): 158- 170. |
10 |
REN M M , ZHAO X Z , WANG A F . On the varieties of ai-semirings satisfying x3≈x[J]. Algebra Universalis, 2017, 77 (4): 395- 408.
doi: 10.1007/s00012-017-0438-z |
11 |
ZHAO X Z . Idempotent semirings with a commutative additive reduct[J]. Semigroup Forum, 2002, 64 (2): 289- 296.
doi: 10.1007/s002330010048 |
12 |
TIAN J , SHAO Y , ZHAO X Z . Out subword-free languages and its subclasses[J]. International Journal of Foundation of Computer Science, 2016, 27 (3): 305- 326.
doi: 10.1142/S0129054116400116 |
13 | TIAN J , CHEN Y , XU H . An algebraic characterization of prefix-strict languages[J]. Mathematics, 2022, 10 (19): 1- 17. |
14 | HOWIE M J . Fundamental of semigroup theory[M]. Oxford: Oxford University Press, 1995. |
15 | HAINES L H . On free monoids partially ordered by embedding[J]. Journal of Combinatorial Theory, 1969, 6 (2): 94- 98. |
16 | BURRIS S , SANKAPPANAVAR H P . A course in universal algebra[M]. New York: Springer, 1981. |
[1] | 邵勇. 半格序完全正则周期半群[J]. 山东大学学报(理学版), 2018, 53(10): 1-5. |
[2] | 杨伟萍1,林梦雷2. 直觉模糊信息系统中的信息粒度[J]. J4, 2012, 47(1): 87-92. |
[3] | 席慎思,洪晓光,孔 磊,衣升起 . 基于粗糙集理论偏序决策表知识获取方法研究[J]. J4, 2007, 42(11): 82-84 . |
|