3 papers
math.CO2024
Weak Freiman isomorphisms and sequencings of small sets
Simone Costa, Stefano Della Fiore
In this paper, we introduce a weakening of the Freiman isomorphisms between subsets of non necessarily abelian groups. Inspired by the breakthrough result of Kravitz, [14], on cycl…
math.CO2023
A Littlewood-Offord kind of problem in and -sequenceability
Simone Costa
The Littlewood-Offord problem is a classical question in probability theory and discrete mathematics, proposed, firstly by Littlewood and Offord in the 1940s. Given a set of in…
math.CO2023
Weak Heffter Arrays and biembedding graphs on non-orientable surfaces
Simone Costa, Lorenzo Mella, Anita Pasotti
In 2015, Archdeacon proposed the notion of Heffter arrays in view of its connection to several other combinatorial objects. In the same paper he also presented the following varian…