短語詞組短語nonlinear variational inequality equation 非線性變分不等方程variational wave equation 波動(dòng)變分方程variational inequality equation 變分不等方程boundary variational equation 邊界變分方程nonsimultaneous variational equation 非等時(shí)變分方程first variational equation 第一變分方程Variational equation system 變分方程組variational partial differential equation 偏微分方程mixed variational equation 混合變分方程 返回 variational equation