Geometric regularity estimates for elliptic equations

Abstract: Regularity theory for diffusive operators is among the finest treasures of the modern mathematical sciences. It appears in several different fields, such as, differential geometry, topology, numerical analysis, dynamical systems, mathematical physics, economics, etc. Within the general field of Partial Differential Equations, regularity theory places itself in the very core, by bridging the notion of weak solutions (often found by energy methods or probabilistic interpretations) to the classical concept of solutions. In this article we discuss about a new systematic approach, termed geometric tangential analysis, for addressing regularity estimates for elliptic and parabolic problems.