Abstract:
An invertible transformation that preserves the class of quasilinear
second-order equations is proposed. Necessary and sufficient
conditions are found under which this transformation carries a quasilinear
equation into an equation with straight characteristics. For
one quasilinear equation the general solution is found by means of
the transformation. Examples of Lagrangians of the form L(u,uxuy) possessing conservation laws of high order are given.
Citation:
F. Kh. Mukminov, “On straightening the characteristics of a quasilinear second-order equation”, TMF, 75:1 (1988), 18–25; Theoret. and Math. Phys., 75:1 (1988), 340–345