(严格)凸性偏好结构
strict) convex preference structure
半线性偏微分方程
semilinear partial differential equations
semi-linear partial differential equation
变系数线性偏微分方程
linear partial differential equation with variable coefficients
不偏性原则
principle of unbiasedness
常系数线性偏微分方程
linear partial differential equation with constant coefficients