程函方程（Eikonal equation) 是一个非线性偏微分方程

sys := (u(x, t)_t))^2+(u(x, t)_x)^2-4 = 0

行波解
g[1] := {u(x, t) = C4-(2(C1+C2x+C3*t))/\sqrt{C3^2+C2^2}}
g[2] := {u(x, t) = C4+(2(C1+C2x+C3*t))/\sqrt{C3^2+C2^2}}

参考文献

*谷超豪 《孤立子理论中的达布变换及其几何应用》 上海科学技术出版社

*阎振亚著 《复杂非线性波的构造性理论及其应用》 科学出版社 2007年

李志斌编著 《非线性数学物理方程的行波解》 科学出版社

#王东明著 《消去法及其应用》 科学出版社 2002

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George Articolo Partial Differential Equations & Boundary Value Problems with Maple V Academic Press 1998 ISBN 9780120644759