a square of the module of a vector of stress, own vectors, a hybrid condition of plasticity, incomplete and full plasticity, small elastic plastic deformations.

Linear invariants of the main ranged stress which allow to formulate a hybrid two-parametrical condition of plasticity on the basis of which relations of small elastic plastic deformations are entered. The concepts of the theory of small elastic plastic deformations by Genka-Ilyushin [1] and the Karman-Haar [3] come from the suggested as special cases. It is shown that generally at preservation during loading directions of the main axes elastic plastic deformation is complex.