| Title | Summary |
|---|---|
| Relation Between Nonlinear Systems and First-order ODEs | Professor Mattuck (MIT) analyzes the phase-plane portrait of a
predator-prey system, specifically the Volterra-Lotke model. He uses nonintegral and integral methods. He develops the Volterra principle from his analysis of the model. |
| Modeling with Systems | Paul's On-Line Notes on modeling with systems. One example models mixtures in two tanks. A second example models a predator-prey system. A final example models the vibrations of a spring-mass system with two masses. No phase-plane portraits are drawn. |