arXiv:1110.4864v2 [math-ph] 25 Oct 2011 MINISTRY OF EDUCATION AND SCIENCE OF RUSSIAN FEDERATION SAMARA STATE UNIVERSITY MATHEMATICAL PHYSICS PROBLEMS AND SOLUTIONS The Students Training Contest Olympiad in Mathematical and Theoretical Physics (on May 21st – 24th, 2010) Special Issue № 3 of the Series «Modern Problems of Mathematical Physics» Samara Samara University Press 2010