ð»ð¹ð ð°ð·ð°ðð³ð¿ð ðŽð ð»ð°ð¹ð
(ð¹ð ðð¹ð¿ð·ð°ðœð° ð·ð¹ð³ððŽ ððð°ðŒ ð»ðŽððœð·ð°ðð³ ðŽð
ð»ðŽð)
ð»ð¹ð ð°ð·ð°ðð³ð¿ð ðŽð ð»ð°ð¹ð (Leonhard Euler) (â¢ð¹ðŽâ¢ ð²ðð°ððŒðŽðœððžð â¢ð°Ì ðð¶â¢ - â¢ð¹ð·â¢ ð°ðºðð°ðœðŒðŽðœððžð â¢ð°Ì ððð²â¢) ð ð°ð ð·ð°ð¹ð»ð±ð°ð¹ððŸðð ð ð¹ðð°ð»ðŽð¹ð.