# Mathematics Research Institute

## Looking for a new version of Gordon's identities and differential ideals

### Pooneh Afsharijoo (Université Pierre et Marie Curie-Université Paris Diderot )

Fecha: 06/06/2018 12:00
Lugar: Seminario A125, Facultad de Ciencias
Grupo: TAAMC

Abstract:
A partition (of length $\ell$) of a positive integer $n$ is a sequence $\Lambda:(\lambda_1\geq \lambda_2\geq \cdots\geq \lambda_\ell)$ of positive integers $\lambda_i$, for $1\leq i \leq n$, such that $$\lambda_1+\cdots+\lambda_n=n.$$ The integers $\lambda_i$ are called the parts of the partition $\Lambda$. The partitions identities, which stipulate that the number of the partitions of an integer $n$ satisfying a certain condition $A$ is equal to the number of the partitions of $n$ satisfying another condition $B$, play an important role in many areas like number theory, combinatorics, Lie theory, particle physics and statistical mechanics. One family of important partitions identities is called Gordon’s identities. These state the following. Given integers $r\geq 2$ and $1\leq i\leq r$, let $B_{r,i}(n)$ denote the number of partitions of $n$ of the form $(b_1, \ldots, b_s)$, where $b_j − b_{j+r−1}\geq 2$ and at most $i − 1$ of the $b_j$ are equal to $1$. Let $A_{r,i}(n)$ denote the number of partitions of $n$ into parts $\not\equiv 0$, $\pm i$(mod.$2r + 1$). Then $A_{r,i} (n) = B_{r,i} (n)$ for all integer $n$. Using differential ideals, we can conjecture a family of partition identities related to Gordon’s identities. We prove this conjecture for two identities among this family.

# El IMUva os Habla (13/02/20) - Diego Ruano Benito (Universidad de Valladolid) 