On a time-depending Monge-Ampère type equation

Abstract

In this paper, we prove a comparison result between a solution u(x,t), x∈Ω⊂ℝ 2, t∈(0,T), of a time depending equation involving the Monge-Ampre operator in the plane and the solution of a conveniently symmetrized parabolic equation. To this aim, we prove a derivation formula for the integral of a smooth function g(x,t) over sublevel sets of u, {x∈Ω:u(x,t)