The laws of the universe are written in the language of mathematics.Algebra is sufficient to solve many static prob- lems,but the most interesting natural phenomena involve change and are described by equations that relate changing quantities. 4口1日，1元2000 Ordinary Differential EquationsThe laws of the universe are written in the language of mathematics. Algebra is sufficient to solve many static prob￾lems, but the most interesting natural phenomena involve change and are described by equations that relate changing quantities. Ordinary Differential Equations