In fluid dynamics, this man's namesake equations govern inviscid flow. He names a formula for the distance between a triangle's incenter and circumcenter. In topology, his namesake characteristic, chi, is the number of vertices, minus edges, plus faces, which for a polyhedron is always 2. The number of smaller natural numbers coprime to a given natural number is this man's totient function. His namesake circuit is a solut
In fluid dynamics, this man's namesake equations govern inviscid flow. He names a formula for the distance between a triangle's incenter and circumcenter. In topology, his namesake characteristic, chi, is the number of vertices, minus edges, plus faces, which for a polyhedron is always 2. The number of smaller natural numbers coprime to a given natural number is this man's totient function. His namesake circuit is a solution to the Bridges of Königsberg problem, and his namesake formula states that e to the ix equals cis x ["sis ecks"]. For 10 points, name this 18th century Swiss mathematician.
In fluid dynamics, this man's namesake equations govern inviscid flow.
Leonhard {Euler}