Frontiers of Mathematics in China >
Relative locations of subwords in free operated semigroups and Motzkin words
Received date: 12 Dec 2013
Accepted date: 11 Apr 2014
Published date: 24 Jun 2015
Copyright
Bracketed words are basic structures both in mathematics (such as Rota-Baxter algebras) and mathematical physics (such as rooted trees) where the locations of the substructures are important. In this paper, we give the classification of the relative locations of two bracketed subwords of a bracketed word in an operated semigroup into the separated, nested, and intersecting cases. We achieve this by establishing a correspondence between relative locations of bracketed words and those of words by applying the concept of Motzkin words which are the algebraic forms of Motzkin paths.
Key words: Bracketed word; relative location; operated semigroup; Motzkin word; Motzkin path; rooted tree
Shanghua ZHENG , LI GUO . Relative locations of subwords in free operated semigroups and Motzkin words[J]. Frontiers of Mathematics in China, 2015 , 10(5) : 1243 -1261 . DOI: 10.1007/s11464-014-0379-1
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