One of my main interests is using computing to help students learn and apply mathematics. This site has a number of interactive programs both about courses and my research. Many samples of my course materials and several texts are also included. Click the text icons or links above.
I am also interested in modern infinitesimal numbers. In 1960 Abraham Robinson showed how to make Leibniz’ approach to calculus rigorous in the sense of modern mathematics. (He called the theory “non-standard analysis” although the theory is an ordinary part of set theory.) There is a brief course on infinitesimals on this site and references to my research. Click the Infinitesimals link.
A few years ago Mark Nawrot (NDSU) and I developed a mathematical model for the perception of depth from “motion parallax” that answered some open questions. We are actively developing and testing the theory in his lab.