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math.CO2022
A poset version of Ramanujan results on Eulerian numbers and zeta values
Eric Dolores-Cuenca, Jose L. Mendoza-Cortes
We explore the operad of finite posets and its algebras. We use order polytopes to investigate the combinatorial properties of zeta values. By generalizing a family of zeta value i…
math.QA2022
Virtual posets, shuffle algebras and associators
José A. Arciniega-Nevárez, Marko Berghoff, Eric Dolores-Cuenca
We provide a method to construct new associators out of Drinfel'd's KZ associator. We obtain two analytic families of associators whose coefficients we can describe explicitly by a…