1. The problem statement, all variables and given/known data I have to show that the delta function bound state energies can be derived from the finite square well potential. 2. Relevant equations The wave functions in the three regions for the finite square well. (See wikipedia) 3. The attempt at a solution 1. I start from the wave functions and apply the boundary conditions. 2. The coefficient to the Sin portion in the well would vanish and so(B=G=H in the wiki article). 3. Now I am stuck. I try to use the normalization condition but there is not just E (in the form of alpha or k but also the coefficient.