Hyperconfluent third-order supersymmetric quantum mechanics
  The hyperconfluent third-order supersymmetric quantum mechanics, in which all the factorization energies tend to a common value, is analyzed. It will be shown that the final potential as well can be achieved by applying consecutively a confluent second-order and a first-order SUSY transformations, both with the same factorization energy. The technique will be applied to the free particle and the Coulomb potential. 
David J Fernandez C, Encarnacion Salinas-Hernandez
quant-ph hep-th math-ph math.MP