Abstract
Anintervalofapermutation isaconsecutive substring consisting of consecutive symbols. For example,4536 is an interval in the permutation 71453682. These arise in genetic applications. For the applications,it makes sense to generalise soas toallow gaps of bounded size S - 1,both in the locations andthesymbols. Forexample,4527 has gaps bounded by 1 (since3 and6 are missing) and is thereforeaS-interval of ****4*5*27**** for S =2.
After analysingthedistribution of the number of intervals ofauniform random permutation,we study the number of 2-intervals. This is exponentially large,but tightly clustered around itsmean.Perhaps surprisingly,the quenched and annealed means are the same. Our analysis isvia amultivariate generating function enumerating pairs of potential 2-intervals by size and intersection size.
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Corteel, S., Louchard, G., Pemantle, R. (2004). Common Intervals of Permutations. In: Drmota, M., Flajolet, P., Gardy, D., Gittenberger, B. (eds) Mathematics and Computer Science III. Trends in Mathematics. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-7915-6_1
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DOI: https://doi.org/10.1007/978-3-0348-7915-6_1
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