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Polyhedral geometry of refined -Catalan numbers
Matthias Beck, Mitsuki Hanada, Max Hlavacek +3
We study a refinement of the -Catalan numbers introduced by Xin and Zhang (2022, 2023) using tools from polyhedral geometry. These refined -Catalan numbers depend on a ve…
The -positivity of the chromatic symmetric function for twinned paths and cycles
Esther Banaian, Kyle Celano, Megan Chang-Lee +7
The operation of twinning a graph at a vertex was introduced by Foley, Hoàng, and Merkel (2019), who conjectured that twinning preserves -positivity of the chromatic symmetric f…
An Introduction to Completeness of Positive Linear Recurrence Sequences
Elżbieta Bołdyriew, John Haviland, Phúc Lâm +3
A positive linear recurrence sequence (PLRS) is a sequence defined by a homogeneous linear recurrence relation with positive coefficients and a particular set of initial conditions…
Completeness of Positive Linear Recurrence Sequences
Elżbieta Bołdyriew, John Haviland, Phúc Lâm +3
A sequence of positive integers is complete if every positive integer is a sum of distinct terms. A positive linear recurrence sequence (PLRS) is a sequence defined by a homogeneou…
Counting on Euler and Bernoulli Number Identities
Arthur T. Benjamin, John Lentfer, Thomas C. Martinez
While there are many identities involving the Euler and Bernoulli numbers, they are usually proved analytically or inductively. We prove two identities involving Euler and Bernoull…