@incollection{gomez-ullateLadderOperatorsRational2021,
 abstract = {This note presents the classification of ladder operators corresponding to the class of rational extensions of the harmonic oscillator. We show that it is natural to endow the class of rational extensions and the corresponding intertwining operators with the structure of a category REXT. The combinatorial data for this interpretation is realized as a functor  MD -$>$ REXT, where MD  refers to the set of Maya diagrams appropriately endowed with categorical structure. Our formalism allows us to easily reproduce and extend earlier results on ladder operators.},
 address = {Cham},
 author = {Gómez-Ullate, David and Grandati, Yves and McIntyre, Zoé and Milson, Robert},
 booktitle = {Quantum Theory and Symmetries},
 doi = {10.1007/978-3-030-55777-5_11},
 editor = {Paranjape, M. B. and MacKenzie, Richard and Thomova, Zora and Winternitz, Pavel and Witczak-Krempa, William},
 isbn = {978-3-030-55776-8 978-3-030-55777-5},
 langid = {english},
 pages = {121--130},
 publisher = {Springer International Publishing},
 title = {Ladder Operators and Rational Extensions},
 urldate = {2025-10-19},
 year = {2021}
}