Applications of Semi-Invariants in SolvingMath Competition Problems

摘要

Diana Tsvetkova is a Teacher of math-ematics at Sofia High School of Mathe-matics, Sofia, Bulgaria. She has a lot ofexperience working with students witha special interest in Mathematics andpreparing them for National and Inter-national competitions. She has been ateam leader during many internationalmath competitions (EMIC, WYMIC,Tuymaada). Her students won goldat the 2004 IMO and have won manyprizes in other competitions.