Comment on the Direct-Matrix Solution of a Singular Lippmann—Schwinger Equation

A discussion of the numerical performance of singular integrals appearing in the Fredholm series leads to a procedure for obtaining the Fredholm determinant over a continuous range of energies using a single fixed quadrature mesh. The same analysis shows that the singular momentum-space Lippmann---Schwinger equation may be inverted by direct-matrix methods with no error arising from the singularity.