Content area
Abstract
The converse to Herbrand's theorem was first proved by Kenneth Ribet in his paper “A Modular Construction of Unramified p-Extensions of Q(μp)” (1976) using tools from modular forms and algebraic geometry. The proof uses many important techniques often found in number theory. In this thesis, I give an introduction to modular forms and algebraic geometry as well as algebraic number theory and cyclotomic fields in preparing the reader for Ribet's proof. The thesis contains Ribet's proof in the last chapter.