$\lambda$-Griffiths polynomials: Bispectrality and biorthogonality
Abstract
We introduce a generalization of bivariate Griffiths polynomials depending on
an additional parameter $\lambda$. These $\lambda$-Griffiths polynomials are
bivariate, bispectral and biorthogonal. For two specific values of the
parameter $\lambda$, they become orthogonal. One of the value is related to the
usual bivariate Griffiths polynomials, while the second value produces new
orthogonal bivariate polynomials.