Permutations and words counted by consecutive patterns |
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Authors: | Anthony Mendes Jeffrey Remmel |
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Institution: | aDepartment of Mathematics, California Polytechnic State University, San Luis Obispo, CA 93407, USA;bDepartment of Mathematics, University of California, San Diego, La Jolla, CA 92093-0112, USA |
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Abstract: | Generating functions which count occurrences of consecutive sequences in a permutation or a word which matches a given pattern are studied by exploiting the combinatorics associated with symmetric functions. Our theorems take the generating function for the number of permutations which do not contain a certain pattern and give generating functions refining permutations by the both the total number of pattern matches and the number of non-overlapping pattern matches. Our methods allow us to give new proofs of several previously recorded results on this topic as well as to prove new extensions and new q-analogues of such results. |
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