Why do we study Ordinary Differential Equations? 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0y￥至无3000 Peipei Shang School of Mathematical Sciences shang@tongji.edu.Ordinary Differential EquationsWhy do we study Ordinary Differential Equations? 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. Peipei Shang School of Mathematical Sciences shang@tongji.edu.cn Ordinary Differential Equations