2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191453I concentrate in this article on the reaction--coherent pion production by neutrinos incident on nuclei. A special effort is made in order to describe the approximations entering the calculation. I conclude that the reaction is well understood and with appropriate data for hadronic reactions is can be computed for low and high energies. Because of shortage of space I omitted the resonance analysis, which is described in articles with my collaborators.4 pages. Proceedings of Conf. to be published by APS-ProceedingsHigh Energy Physics - Phenomenologytext