Geodesic
Prolific Compositions
Discrete mathematics & theoretical computer science, Permutation Patters 2018, Tome 21 (2019) no. 2 Cet article a éte moissonné depuis la source Episciences

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Under what circumstances might every extension of a combinatorial structure contain more copies of another one than the original did? This property, which we call prolificity, holds universally in some cases (e.g., finite linear orders) and only trivially in others (e.g., permutations). Integer compositions, or equivalently layered permutations, provide a middle ground. In that setting, there are prolific compositions for a given pattern if and only if that pattern begins and ends with 1. For each pattern, there is an easily constructed automaton that recognises prolific compositions for that pattern. Some instances where there is a unique minimal prolific composition for a pattern are classified. 
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     author = {Tannock, Murray and Albert, Michael},
     title = {Prolific {Compositions}},
     journal = {Discrete mathematics & theoretical computer science},
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     doi = {10.23638/DMTCS-21-2-10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.23638/DMTCS-21-2-10/}
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Tannock, Murray; Albert, Michael. Prolific Compositions. Discrete mathematics & theoretical computer science, Permutation Patters 2018, Tome 21 (2019) no. 2. doi: 10.23638/DMTCS-21-2-10

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