Equidistribution and sign-balance on 321-avoiding permutations.
Adin, Ron M., Roichman, Yuval (2004)
Séminaire Lotharingien de Combinatoire [electronic only]
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Displaying similar documents to “ECO species.”
Equidistribution and sign-balance on 321-avoiding permutations.
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We define a new unification problem, which we call β-unification and which can be used to characterize the β-strong normalization of terms in the λ-calculus. We prove the undecidability of β-unification, its connection with the system of intersection types, and several of its basic properties.
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