On the stability in Bonnet's theorem of the surface theory

In the space Rn+1, n-dimensional surfaces are considered having the parametrizations which are functions of the Sobolev class W-p(2) with p > n. The first and the second fundamental tensor are defined. The Peterson - Codazzi equations for such functions are understood in some generalized sense. It is proved that if the first and the second fundamental tensor of one surface are close to the first and, respectively, to the second fundamental tensor of the other surface, then these surfaces will be close up to the motion of the space Rn+1. A difference between the fundamental tensors and the nearness of the surfaces are measured with the help of suitable W-norms. The proofs are based on a generalization of Frobenius' theorem about completely integrable systems of the differential equations which was proved by Yu. E. Borovskii. The integral representations of functions by differential operators with complete integrability condition are used, which were elaborated by the author in his other works.