His name graces an inequality with Schwarz that can be used to prove the Triangle Inequality for vectors.
One of his earliest papers proved that the angles of a convex polyhedron are determined by its faces. His name graces an inequality with Schwarz that can be used to prove the Triangle Inequality for vectors. His name with Kovalevskaya is used for a theorem to find the solutions of partial differential equations. His most famous theorem states that integrating any complex valued function around a curve gives zero provided that the function is differentiable everywhere inside the curve. FTP, identify this French mathematician and father of complex analysis.
One of his earliest papers proved that the angles of a convex polyhedron are determined by its faces.
Augustin Louis {Cauchy}