The structural equations of Cartan and the wave solution Einstein's   equation
  Work consists of introduction, two chapters, conclusion and four applications. In this work is examined the condition, with which the wave space metrics of Riemann- Cartan is the solution of Einstein equation in the void. Geometric structures were for this purpose studied on the differentiated variety: connectedness, curvature and twisting connectedness. For this was used this analytical apparatus of differential geometry as the calculation of exterior forms.   In the first chapter the following concepts are examined: - variety; - vectors and 1- forms on the varieties; - metric tensor, connectedness and the covariant derivative; - form with the values in the vector spaces; - the structural equations of Cartan. The second chapter is dedicated to the presence of condition, during which wave certificate is the solution of Einstein equation in the void. Using the first and second structural equations of Cartan for the variety without twisting of that allotted by wave certificate, they were calculated: the 1- forms of connectedness and the coefficients of connectedness, and also Riemann tensor, Ricci tensor and scalar of curvature.   In appendix 1 the derivation of formula for the coefficients of connected-ness in the space with the twisting is given. In appendix 2 the calculation of the components of the 1- forms of connectedness is carried out. In appendix 3 the calculations of the components of the 2- forms of curvature are presented. In appendix 4 the components of Ricci tensor are calculated. 
Vladimir N. Shcherban, Olga V. Baburova