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» Prime Decompositions of Regular Languages
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DLT
2006
14 years 9 days ago
Prime Decompositions of Regular Languages
We investigate factorizations of regular languages in terms of prime languages. A language is said to be strongly prime decomposable if any way of factorizing the language yields a...
Yo-Sub Han, Kai Salomaa, Derick Wood
FUIN
2007
133views more  FUIN 2007»
13 years 11 months ago
Intercode Regular Languages
Intercodes are a generalization of comma-free codes. Using the structural properties of finite-state automata recognizing an intercode we develop a polynomial-time algorithm for d...
Yo-Sub Han, Kai Salomaa, Derick Wood
COCOON
2006
Springer
14 years 2 months ago
Overlap-Free Regular Languages
We define a language to be overlap-free if any two distinct strings in the language do not overlap with each other. We observe that overlap-free languages are a proper subfamily of...
Yo-Sub Han, Derick Wood
COMBINATORICS
2006
144views more  COMBINATORICS 2006»
13 years 11 months ago
Weighted Zeta Functions of Graph Coverings
We present a decomposition formula for the weighted zeta function of an irregular covering of a graph by its weighted L-functions. Moreover, we give a factorization of the weighte...
Iwao Sato