Terminology Definition(DE） Differential equations:equations containing an unknown func- tion and one or more of its derivatives. Definition (ODE) Ordinary differential equations:differential equations that in- volve an unknown function of a single independent variable. 4日10,1元2000 Ordinary Differential EquationsTerminology Definition (DE) Differential equations: equations containing an unknown func￾tion and one or more of its derivatives. Definition (ODE) Ordinary differential equations: differential equations that in￾volve an unknown function of a single independent variable . Example The population function P(t) dP dt = kP Ordinary Differential Equations