Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Chaos theory before it was...

I suppose the best thing about this book is that it is cheap.It was written at a time before Henon and modern chaos theorybecame the rage.It is very good on van der Pol oscillatory theory.It doesn't mention economics, population, prey-predator dynamicsor Mandelbrot,but it deals with the equations, none the lessfrom what is at times an over generalized point of view.It is very good on systems of linear differential equationswith both periodic solutions and near-periodic solutions.It doesn't use the more modern Jacobian approach, but an earlier one.I found information in here that was useful to my own research.