Smoothness of solutions of the Dirichlet problem for the biharmonic equation in nonsmooth 2D domains.

The article focuses on solution estimation for biharmonic equation of Dirichlet problem. Topics discussed include utilization of methods for smoothness analysis of solutions for biharmonic equation, solution for independent variables with infinity and boundary points, evaluation of energy involved Saint-Venant's principle for elasticity, consideration of infinity point for generalized solution of Navier-Stokes equation for the problem and establishment of solution by theorem for the problem.