常: ordinary; common; normal多步法: multistep method求解: find the solution常微分方程单步法求解: single-steode solver常微分方程求解: ode solver常微分方程刚性求解: stiff ode solver常微分方程可变步长求解: fixed stsize ode solver常微分方程: gewoehnliche differentialgleichungen ordinary differential equations; ordinary differentical equations常微分方程式: problem of ordinary differential equation常微分方程组: system of ordinary differential equations常微分方程固定步长求解法: fixed stsize ode solver常微分方程补充: often differential equation complementary常微分方程次数: degree of ode初等常微分方程: elementary ordinary differental equation; elementary ordinary differential equation二阶常微分方程: second order ordinary differential equation级数与常微分方程: series and ordinary differential equations联立常微分方程: simultaneous ordinary differential equation线性常微分方程: linear ordinary differential equation; ordinary linear differential equation常微分方程边值问题: boundary value problem of ordinary differential equation; boundary value problem ofdinary differential equation; bvp常微分方程变换群理论: transformation grouthenary differential equation; transformation groutheory in ordinary differential equation常微分方程初值问题: initial value problem of dinary differential equation; initial value problem of ordinary differential equation常微分方程的初值问题: initial value problem of ordinary differential equation常微分方程定性理论: qualitative theory of ordinary differential equation常微分方程解析理论: analytic theory of ordinary differential equation常微分方程近似解析解: approximate analytic solnary differential equation; approximate analytic solution of ordinary differential equation