One of his most celebrated contributions is the series of books that offer a comprehensive collection of problems and solutions from various mathematical competitions around the world. These books not only serve as a preparation tool for students aiming to excel in such competitions but also as a resource for teachers looking for new and engaging ways to teach mathematical concepts.

Page 2. Putnam and Beyond. Page 3. R˘azvan Gelca. Titu Andreescu. Putnam and Beyond. Page 4. R˘azvan Gelca. Texas Tech University. WordPress.com