2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153813We survey some topics involving the Whitham equations, concentrating on the role of the product of the wave function and its adjoint in averaging and in producing Cauchy kernels and differentials on Riemann surfaces. There are also some new results.Latex, 81 pages, run three times for table of contentsExactly Solvable and Integrable SystemsHigh Energy Physics - Theorytext