Examples of nonlinear differential equations are the Navier -- Stokes equations in fluid dynamics and the Lotka -- Volterra equations in biology .
Problems involving nonlinear differential equations are extremely diverse , and methods of solution or analysis are problem dependent .
Examples of nonlinear differential equations are the equations       in fluid dynamics and the Lotka -- Volterra equations in biology .
Problems involving nonlinear differential equations are extremely diverse , and methods of solution or analysis are problem dependent .