8. The Classes BmN1CHAPTER 3. LINEAR EQUATIONS; 1. Solvability of the Dirichlet Problem in the Spaces Cl,a(O), l>=2; 2. Schauder's A Priori Estimate; 3. The Solvability in C2,a(O) of Other Boundary-Value Problems; 4. Generalized Solutions in w12 (O) The First Fundamental Inequality; 5. Solvability of the First Boundary-Value Problem in W12(O); 6. The Second and Third Boundary-Value Problems; 7. Interior Estimates in L2 of the Second Derivatives of an Arbitrary Function in Terms of the Values of an Elliptic Operator Applied to It; 8. The Second Fundamental Inequality for Elliptic Operators