He names lines passing through the center of a nine-point circle, centroid, circumcenter, and orthocenter of a triangle.
This man proved that geodesic structures must contain 12 pentagons and some number of hexagons in order to be spheroid. He names lines passing through the center of a nine-point circle, centroid, circumcenter, and orthocenter of a triangle. This man generalized Fermat's little theorem using his namesake totient function and derived a formula stating that the vertices minus the edges plus the faces must be two for polyhedra. Another formula he names states that "e to the i pi" plus one equals zero. For 10 points, name this Swiss mathematician who solved the Seven Bridges of Konigsberg problem and defined transcendental numbers such as e.
This man proved that geodesic structures must contain 12 pentagons and some number of hexagons in order to be spheroid.
Leonhard {Euler}