RT Journal Article T1 Exceptional orthogonal polynomials and the Darboux transformation A1 Gómez-Ullate Otaiza, David A1 Kamran, N. A1 Milson, R. AB We adapt the notion of the Darboux transformation to the context of polynomial Sturm-Liouville problems. As an application, we characterize the recently described X(m) Laguerre polynomials in terms of an isospectral Darboux transformation. We also show that the shape invariance of these new polynomial families is a direct consequence of the permutability property of the Darboux-Crum transformation. PB IOP Publishing Ltd SN 1751-8113 YR 2010 FD 2010-10-29 LK https://hdl.handle.net/20.500.14352/44630 UL https://hdl.handle.net/20.500.14352/44630 LA eng NO © IOP Publishing Ltd.The research of DGU was supported in part by MICINN-FEDER grant MTM2009- 06973 and CUR-DIUE grant 2009SGR859. The research of NK was supported in part by NSERC grant RGPIN 105490-2004. The research of RM was supported in part by NSERC grant RGPIN-228057-2004. NO MICINN NO CUR-DIUE NO NSERC DS Docta Complutense RD 7 jun 2025