This man's namesake tensor has only 20 independent components despite having four indices.
This man's namesake tensor has only 20 independent components despite having four indices. His tensor satisfies the Bianchi identity, and can be contracted to form the Ricci tensor. The equations giving necessary and sufficient conditions for a function to be complex differentiable are named for this man and Cauchy. The Jordan measure underlies his namesake integral, which is generalized by the Stieltjes [STEEL-tyes] and Lebesgue [le-BES-gay] integrals and based on his namesake sums. For 10 points, name this mathematician with a namesake hypothesis about the non-trivial zeros of his namesake zeta function.
This man's namesake tensor has only 20 independent components despite having four indices.
Georg Friedrich Bernhard {Riemann}