Cornell University hosts this impressive collection of Historical Math Monographs, made available for free public viewing online. The default option for reading the books is to view pages as images within a Web browser, but users can also choose to view text only; another option is to view pages as pdf files (but this may not be working properly). Many authors have works showcased in the...

Have you ever wondered about the mathematics behind the idea of "six degrees of separation?" The Erd's Number Project offers several fairly comprehensive lists of co-author relationships to elaborate (with a bit of humor) studies of the dynamics involved in "the collaboration graph," which the website says is "a 'real-life' fairly large graph for combinatorialists to study." The co-author...

History of Mathematics, provided by David E. Joyce of Clark University's Department of Mathematics and Computer Science, contains some unique material including the Regional Mathematics, Chronology, and Timelines sections. Chronology and Timelines each provide timelines for mathematicians BCE and CE in both Western and non-Western civilizations. Regional Mathematics takes the same approach, but...

Johannes Kepler is known for his many mathematical discoveries, and he was quite keen on calculating areas and volumes. This interest stemmed from an incident that occurred when he married for the second time in Austria. He had purchased a barrel of wine for his wedding, and was angered by the wine merchant's method for measuring the volume. Inspired by this exchange, Kepler began his study of how...

The brainchild of retired mathematics professor Harry B. Coonce, this site has the modest goal of listing information about everyone who has earned a doctorate in mathematics during the 20th century. This will allow mathematicians to trace their academic "family tree" and discover their advisor's advisor, their advisor's "siblings" at graduate school, and so on. With over 28,000 names from 380...

Trinity College in Ireland hosts this site about the History of Mathematics. Rather than identifying key discoveries and theorems, the site mainly gives accounts of many prominent mathematicians and focuses on their research and contributions. Most material deals with the period between the 17th and 19th centuries, a time that produced many ideas that form the basis of modern mathematics. Some...

Do you ever find yourself wondering "Hey, who's that mathematician?" Well, wonder no more as this collection from the Mathematical Association of America (MAA) can provide answers to such a query. Noted mathematician Paul R. Halmos snapped hundreds of photographs of mathematicians he met around the world. Recently, these photos were digitized by the Archives of American Mathematics and they are...