The globally homeomorphic solutions to Beltrami system in Cn.
For certain Fréchet spaces of entire functions of several variables satisfying some specified growth conditions, we define a constant coefficient differential operator as the transpose of a convolution operation in the dual space of continuous linear functionals and show that for in one of these spaces, their always exists a solution of the differential equation in the same space.
We study the gradient flow for the relative entropy functional on probability measures over a riemannian manifold. To this aim we present a notion of a riemannian structure on the Wasserstein space. If the Ricci curvature is bounded below we establish existence and contractivity of the gradient flow using a discrete approximation scheme. Furthermore we show that its trajectories coincide with solutions to the heat equation.