His current mathematical interests are in modular arithmetic and cryptography.
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Paul Zeitz is the author of The Art and Craft of Problem Solving, a great resource for mathematical olympiads.
He also visits many mathematics camps such as Math Path, MOP, and Mathcamp.
Also, “studying a book” rarely means what I just described. Others would read it slowly and carefully, attempt to solve some of the problems, succeed in solving a number of them, and ask for help with the others.
This is perfectly fine and very useful, and you'll gain a lot by studying it this way.In high school, Zeitz won the USA Mathematical Olympiad in 1974 and went on to compete on the first US team to attend the International Mathematical Olympiad in East Germany., Paul Zeitz establishes the distinction and introduces readers into the culture of problem solving.Zeitz’s book presents problem sets at the end of every subchapter.The problems come in three types: classic, contest, and exploration.Given the difficulty of some of the problems, a solutions section would be a welcome amenity.There is, however, an additional instructor’s manual that can be purchased.Recreational problems, as the name suggests, are fun puzzles that require creativity.Contest problems, from sources such as the AIME and IMO, are formal problems that can be quite difficult.One defect of Zeitz’s book is the lack of a solutions section.Though each chapter explains sample problems in great detail, the problem sets presented at the end of each subchapter do not have solutions.