来源：ELECTRONIC JOURNAL OF COMBINATORICS, 2016, 23(2): P2.49.
DOI：10.37236/6115
摘要
A permutation class is splittable if it is contained in the merge of two of its proper subclasses. We characterise the unsplittable subclasses of the class of separable permutations both structurally and in terms of their bases.
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