3 papers
math.CO2026
Sizes of witnesses in Covtree
Jette Gutzeit, Kimia Shaban, Karen Yeats +1
Given a set of unlabelled posets, each of size , we say that a poset is a \emph{witness} to if is the set of downsets of size of . We say that …
math.CO2025
The algebraic structure of Dyson--Schwinger equations with multiple insertion places
Nicholas Olson-Harris, Karen Yeats
We give combinatorially controlled series solutions to Dyson--Schwinger equations with multiple insertion places using tubings of rooted trees and investigate the algebraic relatio…
math.CO2025
Combinatorial interpretation of the coefficients of the causal set d'Alembertian
Karen Yeats
The causal set theory d'Alembertian has rational coefficients for which alternating expressions are known. Here, a combinatorial interpretation of these numbers is given.