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A mean identity for longest increasing subsequence problems

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arxiv math/0004082 v2 pith:KNQNPGUG submitted 2000-04-12 math.CO math.PR

classification math.COmath.PR
keywords meanincreasingsubsequenceasymptoticgiveslongestproblemsadmit
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We show that a wide variety of generalized increasing subsequence problems admit a one parameter family of extensions for which we can exactly compute the mean length of the longest increasing subsequence. By the nature of the extension, this gives upper bounds on the mean in the unextended model, which turn out to be asymptotically tight for all of the models that have so far been analyzed. A heuristic analysis based on this fact gives not just the asymptotic mean but also the asymptotic scale factor, again agreeing with all known cases.

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    math.PR 2019-08 accept novelty 8.0 of 10

    For the inhomogeneous exponential corner growth model, the paper proves explicit variational formulas for the growth asymptotics, identifies the limit shape with flat segments and spikes, and derives the disordered TA...

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