Combinatorics of Compositions and Words (Discrete by Toufik Mansour, Silvia Heubach

By Toufik Mansour, Silvia Heubach

Publish yr note: First released July 1st 2009

A One-Stop resource of recognized effects, a Bibliography of Papers at the topic, and Novel study Directions

Focusing on a truly energetic quarter of study within the final decade, Combinatorics of Compositions and Words offers an creation to the tools utilized in the combinatorics of development avoidance and development enumeration in compositions and phrases. It additionally offers a number of instruments and ways which are acceptable to different components of enumerative combinatorics.

After a old viewpoint on study within the zone, the textual content introduces concepts to unravel recurrence kin, together with new release and producing features. It then makes a speciality of enumeration of simple facts for compositions. The textual content is going directly to current effects on trend avoidance for subword, subsequence, and generalized styles in compositions after which applies those effects to phrases. The authors additionally disguise automata, the ECO process, producing bushes, and asymptotic effects through random compositions and intricate analysis.

Highlighting either tested and new effects, this ebook explores various instruments for enumerating styles in compositions and phrases. It incorporates a entire bibliography and accommodates using the pc algebra platforms Maple and Mathematica(r), in addition to C++ to accomplish computations.

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He enumerated for example the total number of summands and derived connections with the alternate Fibonacci sequence. † [115] Historical overview – Words We now turn our attention to words. The origins of research activity for words are a little harder to pin down because they arise naturally in many different settings, for example in group theory to describe algebras, in probability theory to describe coin-tossing experiments and in computer science in the context of automata (see Chapter 7) and formal languages.

K if the reduced form of any subsequence of k consecutive terms of σ equals τ . Otherwise we say that σ avoids the subword pattern τ or is τ -avoiding. A sequence avoids a set T of subword patterns if it simultaneously avoids all subword patterns in T . We denote the set of sequences with parts in a set F that avoid subword patterns from the set T by F (T ). 25 The sequence 1413364 avoids the substring 12, but has three occurrences of the subword pattern 12 (namely 14, 13 and 36). It also avoids the subword pattern 123.

After these initial results on words, the literature became quiet for a while, with the exception of a few individual papers. Schensted [177] in 1961 derived results on the number of longest increasing and decreasing subsequences in words, and Carlitz and his collaborators enumerated statistics on words as well as the number of restricted words in a number of papers from the 1970s. In 1983, the first of two volumes on the combinatorics of words from an algebraic and group theoretic point of view appeared, authored by M.

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