On November 14, 1750 Leonhard Euler sent a letter from Berlin to his friend Christian Goldbach in St. Petersburg announcing his discovery of a simple relationship between the features on a polyhedron. This observation, now...
Bryant, Lance, Sarah Bryant, and Diana White. " Striking the Right Chord: Math Circles Promote (Joyous) Professional Growth." In The Celebration of the EDGE Program's Impact on the Mathematics Community and Beyond, edited by...