2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95172In this essay I will give a strictly subjective selection of different types of zeta functions. Instead of providing a complete list, I will rather try to give the central concepts and ideas underlying the theory. This article is going to appear in the collected works of Erich Kähler.LaTex, 15 pagesNumber Theorytext