On Laguerre–Hahn linear functionals: the symmetric companion

A Classification of Symmetric (1, 1)-Coherent Pairs of Linear Functionals

“…Semiclassical symmetric linear functionals of order at most two are the natural framework of our study. They have been analyzed by many authors (see [33][34][35][36][37], among others). On the other hand, the so-called symmetrization process for linear functionals (see [3]) will play a central role in this contribution.…”