TY - GEN AU - Filipuk, Galina AU - Mañas Mañas, Juan Francisco AU - Moreno Balcázar, Juan José PY - 2022 SN - 1563-5120 UR - http://hdl.handle.net/10835/16077 AB - We consider a general Sobolev--type inner product involving the Hahn difference operator, so this includes the well--known difference operators $\mathscr{D}_{q}$ and $\Delta$ and, as a limit case, the derivative operator. The objective is to construct... LA - en KW - Sobolev orthogonal polynomials KW - Hahn difference operator KW - Ladder operators KW - Difference equations KW - Classical orthogonal polynomials KW - Differential operator TI - Second--order difference equation for Sobolev--type orthogonal polynomials. Part I: theoretical results ER -