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- W2888928260 abstract "A Catalan magma is a unique factorisation normed magma with only one irreducible element. The val partitions the base set into subsets enumerated by Catalan numbers. The primary theorem characterises the conditions which a set a with product map must satisfy in order to be a free magma generated by the irreducible elements. This theorem can be used to prove a set of objects (with a product map) is a Catalan magma. The isomorphism between Catalan magmas gives a bijection -- essentially one bijection algorithm for all pairs of families. The morphism property ensures the bijection is recursive. The universal bijection allows us to give some rigour to the idea of an embedding bijection between Catalan objects which, in many cases, shows how to embed an element of one Catalan family into one of a different family. Multiplication on the right (respectively left) by the generator gives rise to the right (respectively left) Narayana statistic. The statistic is invariant under the universal bijection and hence allows us to determine what structures of any Catalan family are associated with this refinement. We discuss the relation between the symbolic method for Catalan families and the magma structure on the base set defined by the symbolic method. This shows which atomic elements are also irreducible. The appendix gives the magma structure for 14 Catalan families." @default.
- W2888928260 created "2018-09-07" @default.
- W2888928260 creator A5071575526 @default.
- W2888928260 date "2018-08-28" @default.
- W2888928260 modified "2023-09-27" @default.
- W2888928260 title "A Universal Bijection for Catalan Structures" @default.
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