Miscellanea of Analysis.- Fluid Equations.- The Steady Navier-Stokes System.- The Non-steady Navier-Stokes System.- The Steady Navier-Stokes System with Friction Boundary Conditions.- The Non-steady Navier-Stokes System with Friction Boundary Conditions.- The Steady Boussinesq System.- The Non-steady Boussinesq System.- The Steady Equations for Heat-conducting Fluids.- The Non-steady Equations for Heat-conducting Fluids.