Let us consider the following elliptic systems of second order-D<sub>α</sub>(A<sub>i</sub><sup>α</sup>(x, u, Du))=B<sub>4</sub>(x, u, Du), i=1, …, N, x∈Q(?)R<sup>n<
In the studies of nonlinear partial differential equations, the influence, from the singularities of coefficients to the singularities of solution, is a field t
We calculate the first obstruction to regular homotopy of an immersion f: R<sup>n+k</sup> into rof for a reflection r of R<sup>n+k</sup>. In the case of k=n-1 w