Introduction to the Regularity Theory for Elliptic Systems, Harmonic Maps and Minimal Graphs

This volume deals with the regularity theory for elliptic systems. We may find the origin of such a theory in two of the problems posed by David Hilbert in his celebrated lecture delivered during the International Congress of Mathematicians in 1900 in Paris:19th problem: Are the solutions to regular problems in the Calculus of Variations always necessarily analytic?20th problem: does any variation...