On a generalization of the It\^{o}-Wentzell formula for system of   generalized It\^{o}'s SDE and the stochastic first integral
  Generalization of the It\^{o}-Wentzell formula for the generalized It\^{o}'s SDE (It\^{o}'s GSDE) system with a non-centered measure is constructed on the basis of the stochastic kernel of integral transformation. The It\^{o}'s GSDE system for the kernel the solution of which is the kernel of the integral invariant, is formed. This invariant is connected with the solution of the It\^{o}'s GSDE system non-centered measure. The concept of a stochastic first integral of the It\^{o}'s GSDE system with non-centered measure is introduced and conditions that when being performed the random function is the first integral of the set It\^{o}'s GSDE system are defined. 
Elena V. Karachanskaya
math.PR