2 papers
math-ph2003
The X-ray problem revisited
Estelle L. Basor, Yang Chen
In this letter we re-visit the X-ray problem. Assuming point interaction between the conduction electrons and the first instantaneously created core-hole, the latter's Green's func…
math.CA2003
Jacobi Polynomials from Compatibility Conditions
Yang Chen, Mourad Ismail
We revisit the ladder operators for orthogonal polynomials and re-interpret two supplementary conditions as compatibility conditions of two linear over-determined systems; one invo…