Jointly orthogonal polynomials

@article{Felder2015JointlyOP,
  title={Jointly orthogonal polynomials},
  author={G. Felder and T. Willwacher},
  journal={J. Lond. Math. Soc.},
  year={2015},
  volume={91},
  pages={750-768}
}
The theory of polynomials orthogonal with respect to one inner product is classical. We discuss the extension of this theory to multiple inner products. Examples include the Lame and Heine-Stieltjes polynomials. As a consequence, we give a new characterization of these classical families of polynomials by their orthogonality properties, without reference to differential equations. 
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