Table of contents : Introduction....Pages 1-4 Weak solutions to boundary value problems in the deformation theory of perfect elastoplasticity....Pages 5-39 Differentiability properties of weak solutions to boundary value problems in the deformation theory of plasticity....Pages 40-130 Quasi-static fluids of generalized Newtonian type....Pages 131-206 Fluids of Prandtl-Eyring type and plastic materials with logarithmic hardening law....Pages 207-259