中文摘要：

研究带凸Hamiltonian的高维Hamilton-Jacobi(HJ)方程特征线的性质.证明了HJ方程解的表达式中的极值曲线是特征线,对上半空间中任一点,都存在1条有效特征线段经过它.

英文摘要：

This paper is concerned with the Hamilton-Jacobi(HJ) equations of multidimensional space variables with convex Hamiltonians.The author proves the extreme curve in the formula of the solution to the HJ equation is a characteristic and for each point in upper half-space,there exists a valid characteristic segment passing through it.