where \(x\) is the independent variable, \(y\) is the dependent variable, and \(y',...,y^{(n)}\) are the derivatives of \(y\) with respect to \(x\) . ODEs are widely used to model population growth, chemical reactions, electrical circuits, and mechanical systems, among others.

An ordinary differential equation is an equation that involves a function and its derivatives. The general form of an ODE is:

A differential-algebraic equation is an equation that involves a function, its derivatives, and algebraic constraints. The general form of a DAE is:

where \(x\) is the independent variable, \(y\) is the dependent variable, and \(y'\) is the derivative of \(y\) with respect to \(x\) . DAEs are widely used to model systems with constraints, such as mechanical systems with kinematic constraints.