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- W2071863041 abstract "A composition π=π1π2⋯πm of a positive integer n is an ordered collection of one or more positive integers whose sum is n. The number of summands, namely m, is called the number of parts of π. We say that π contains a rise, a weak-rise, a level, a descent, or a weak-descent at position i according to whether πi<πi+1, πi⩽πi+1, πi=πi+1, πi>πi+1, or πi⩾πi+1. Using linear algebra, we determine formulas for generating functions that count compositions of n with m parts, according to the numbers of rises, weak-rises, levels, descents, and weak-descents, and according to the sum, over all occurrences of the rises, weak-rises, levels, descents, and weak-descents, of the first integers in their respective occurrences." @default.
- W2071863041 created "2016-06-24" @default.
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- W2071863041 date "2014-05-01" @default.
- W2071863041 modified "2023-09-28" @default.
- W2071863041 title "Enumeration of compositions according to the sum of the values of the first letters of the occurrences of a 2-letter pattern" @default.
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- W2071863041 doi "https://doi.org/10.1016/j.laa.2014.02.028" @default.
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