There are several online mathematical dictionaries and other reference materials. For example, try Mathworld, sponsored by Wolfram Research, the mathematical atlas at Northern Illinois University, or the internet mathematics library at Drexel. You can search the combined membership lists of the MAA (Mathematical Association of America), AMS (American Mathematical Society), and SIAM (the Society for Industrial and Applied Mathematics).
For the history of mathematics, the MacTutor History of Mathematics archive is excellent. The site has articles, quotes, biographies, a list of famous curves, other history links, and much more. This archive also sponsors a mathematician of the day, including births, deaths, and a quotation. If your browser supports Java, take a look at this proof of the Theorem of Pythagoras .
The YMN (Young Mathematician's Network) has a home page, including back issues of their newsletter. While this group was created generally for PhD mathematians early in their careers, there is some useful information here for undergraduates about employment and opportunities in mathematics.
Penn State has compiled a long list of other mathematical websites around the world.
Keith Devlin writes a regular column for the
Mathematical Association of America.
The column to which you are taken by the above link is an excellent article of some errors which teachers of mathematics introduce when teaching multiplication. We even find some students at the university level thinking that multiplication is repeated addition.
So what does a mathematician do all day? Here is a some information about mathematical careers in industry and government. Included are profiles of nonacademic mathematicians and a forum for submitting questions. Also included are career planning resources and employment statistics.
The MAA provides online columns on mathematical topics by Ivars peterson, Keith Devlin, Frank Morgan, and Alex Bogomolny.
A summary of the proof of the Four Color Theorem is available.
Herbert Wilf, along with Academic Press, have provided a web version (PDF format) of Herbert's text "Generatingfunctionology". This is a very nice text, but the web version may only be available through July 1, 2000. David Stockburger has a web version of an introductory statistics and data analysis text. DASL (pronounced "dazzle") is an online library of datafiles and stories that illustrate the use of basic statistics methods.
The Morehead Electronic Journal of Applications in Mathematics (MEJAM) is a new forum for publishing undergraduate research, with an emphasis on interdisciplinary work.