Problems for the Mathematical Olympiads - Andrei Negut
From the first team selection test to the IMO.
This is a text on elementary mathematics written by a very promising young mathematician who is at his first experience of this kind. The author, Andrei Negut, now a student at Princeton, was, for years, the winner of high-school national and International Mathematical competitions.
This is an old dream of his, to gather and comment some of the most beautiful problems in mathematics he was thinking about during his intense work and learning.
The result is this wonderful book that contains beside a list of problems in classical fields of mathematics (algebra, geometry, combinatorics) that Andrei loved the most, a lot of original and sometimes even wonderful solutions. The text is well written. The explanations are complete and proving a deep intuition of the author.
I recommend the book to anyone interested professionally or as a hobby in problem solving. Students preparing for mathematical competitions will find a good training material.
I must confess that the feeling that the book represents the beginning of an important career in mathematics, was anytime present when reading the text.  - Radu Gologan