College students who have a firm calculus background can use this site to learn about differential equations. Six main sections explain low and high order differential equations, the Laplace transformation, Fourier series, and much more. Clear, concise descriptions of various topics are presented with equation formulations and the occasional graph or animation. Several example problems with...

This online tutorial is intended for college students taking an early course in mathematical optimization or linear differential equations. Although it is written by a professor of economics, little economic theory is presented. This keeps the material centered on the mathematical aspects of optimization and differential equations, which have a wide range of scientific applications. The text is...

With a development team that includes several well-regarded mathematicians and other such folk, the S.O.S. Mathematics website is a high-quality resource for persons who might find themselves in need of a bit of refresher on topics ranging from algebra to differential equations. Started in 1995, the site currently includes more than 2500 web pages that contain concise explanations of topics that...