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

By Toufik Mansour, Silvia Heubach

Publish yr note: First released July 1st 2009

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

Focusing on a really energetic sector of analysis within the final decade, Combinatorics of Compositions and Words presents an advent to the tools utilized in the combinatorics of trend avoidance and development enumeration in compositions and phrases. It additionally offers a number of instruments and ways which are acceptable to different parts of enumerative combinatorics.

After a old viewpoint on learn within the zone, the textual content introduces options to resolve recurrence family members, together with generation and producing services. It then specializes in enumeration of uncomplicated statistics for compositions. The textual content is going directly to current effects on development avoidance for subword, subsequence, and generalized styles in compositions after which applies those effects to phrases. The authors additionally disguise automata, the ECO technique, producing timber, and asymptotic effects through random compositions and intricate analysis.

Highlighting either demonstrated and new effects, this e-book explores quite a few instruments for enumerating styles in compositions and phrases. It features a accomplished bibliography and comprises using the pc algebra platforms Maple and Mathematica(r), in addition to C++ to accomplish computations.

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Extra resources for Combinatorics of Compositions and Words (Discrete Mathematics and Its Applications)

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Compositions of n in {1, 2} with m parts 1 2 3 ... a1,1 a2,1 a3,1 a4,1 =1 =1 =0 =0 .. a2,2 = 1 a3,2 = 2 a4,2 = 1 .. a3,3 = 1 a4,3 = 3 .. ... .. = 0}}]; a[n_, m_] := a[n, m] = a[n - 1, m - 1] + a[n - 2, m - 1]; Table[a[n, m], {n, 0, 4}, {m, 0, 3}] The Maple code is given by a:=Matrix(5,5): a[1,1]:=1: for m from 2 to 5 do a[1,m]:=0: od: for n from 2 to 5 do a[n,1]:=0; for m from 2 to 5 do if n=m then a[n,m]:=1; elif n

15); in Maple; in Mathematica, we can use L[0] = 2; L[1] = 1; L[n_] := L[n] = L[n - 1] + L[n - 2]; Table[L[n], {n, 0, 15}] For a history of these two sequences, as well as applications where these sequences occur, see [125]. It is customary to use the letters F and L for these two sequences. A third sequence that is closely related to these two is the shifted Fibonacci sequence, defined as fn = Fn+1 for n ≥ 0, which occurs naturally in many different contexts. We will now look at additional examples, namely compositions in {1, 2} and words on [3]; the first of these will give rise to the shifted Fibonacci sequence.

The initial conditions are necessary to ensure a uniquely defined sequence, and consist of the first k values of the sequence, where k equals the difference between the highest and the lowest indices that occur in the recurrence relation. 7 (Recursion for the Fibonacci sequence) The Fibonacci sequence is defined by Fn = Fn−1 + Fn−2 , F0 = 0, F1 = 1, that is, each term is the sum of the two preceding terms, except for the first two values, which are needed to get the recursion started. Hence, the recurrence relation only applies for n ≥ 2.

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