ABSTRACT
The confluent second-order supersymmetric quantum mechanics, for which the factorization energies https://www.w3.org/1998/Math/MathML"> ε 1 , ε 2 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429076619/c00d8d0d-b3a0-431a-a3c2-e044ea15f7a5/content/eq4010.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> tend to a single real value ε, is studied. It is shown that the Wronskian formula, typically used for https://www.w3.org/1998/Math/MathML"> ε 1 ≠ ε 2 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429076619/c00d8d0d-b3a0-431a-a3c2-e044ea15f7a5/content/eq4011.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> , is still valid if generalized eigenfunctions associated to ε are chosen.
