Description
Intersection theory for twisted (co-)homology has become a powerful tool in the
study of Feynman integrals. First introduced as an alternative approach to integral
decomposition, it has since developed into a versatile framework with many applications.
In this talk, I will explain how twisted (co-)homology can be used to encode symmetry
relations among Feynman integrals. I will then show how this framework leads to a formula for the number of master integrals in the presence of symmetries.