... NONLINEAR SYSTEMS OF PARTIAL DIFFERENTIAL EQUATIONS 785 Differentiating each relation in (15.14.4.27) with respect to x and t (as composite functions) and eliminating the partial derivatives u t , ... the first (or the second) equation (15.14.4.16). As a result, we obtain a quasilinear first-order partial differential equation for u(x, t): (f 1 + g 1 Λ m ) ∂u ∂t +(h 1 + k 1 Λ m ) ∂u ∂x = 0, w ....
Ngày tải lên: 02/07/2014, 13:20