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An ordinary differential equation (ODE) is an equation containing an unknown function of one real or complex variable , its derivatives, and some given functions of . The unknown function is generally represented by a variable (often denoted ), which, therefore, depends on . Thus  is often called the independent variable of the equation. The term "ordinary" is used in contrast with the term partial differential equation, which may be with respect to more than one independent variable.

An ordinary differential equation (ODE) is an equation containing an unknown function of one real or complex variable , its derivatives, and some given functions of . The unknown function is generally represented by a variable (often denoted ), which, therefore, depends on . Thus  is often called the independent variable of the equation. The term "ordinary" is used in contrast with the term partial differential equation, which may be with respect to more than one independent variable.

常微分方程是一个方程，包含一个实变量或复变量的未知函数，它的导数，和一些给定的函数。未知函数通常由一个变量(通常表示)表示，因此这个变量依赖于。因此通常被称为方程式的自变量。“普通”一词与偏微分方程一词形成对比，后者可能涉及一个以上的独立变量。

常微分方程中，包含有：只含有一个实变量或复变量的未知函数及其导数以及一些已知的函数。未知函数通常由一个变量(通常表示)表示，因此这个变量依赖于。因此通常被称为方程式的自变量。“普通”一词与偏微分方程一词形成对比，后者可能涉及一个以上的独立变量。