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math.CO2015
Permutations sortable by two stacks in series
Andrew Elvey Price, Anthony J Guttmann
We address the problem of the number of permutations that can be sorted by two stacks in series. We do this by first counting all such permutations of length less than 20 exactly,…
math.CO2015
Permutations sortable by deques and by two stacks in parallel
Andrew Elvey Price, Anthony J. Guttmann
Recently Albert and Bousquet-Mélou \cite{AB15} obtained the solution to the long-standing problem of the number of permutations sortable by two stacks in parallel (tsip). Their sol…