For decades, Alan Siegel and Irene Etzkorn have championed simplicity as a competitive advantage and a consumer right. Consulting with businesses and organizati

Several years ago I was invited to an American university to give one-term graduate course on Siegel modular forms, Hecke operators, and related zeta functions.

A proven resource for high performance, the Siegel’s series keeps you focused on the only thing that matters – the exam. The Siegel’s series relies on a p

The Siegel's Series works through key topics in a Q&A format, providing and additional source for self-quizzing. A proven resource for high performance, each ti