[Wi] P. Winkler, Mathematical Puzzles: A Connoisseur's Collection, A K Peters,
Wellesley, MA (2004).
[Winkler's conjecture about Venn diagrams is included on page 145, with discussion on
The external sites listed below are not endorsed by The Electronic Journal
of Combinatorics and do not form part of this article.
Frank Ruskey maintains a small
(frequently asked questions) containing the answers to some questions
he received about Venn diagrams, but that are outside the scope of this
The set partitions
information page, part of the
about his solution of the 6-Venn triangle problem.
Make sure that you try out his Java applet!
[DE] Stirling Chow has working versions of
online; these Java applets can draw
area-proportional Venn and Euler diagrams using several different algorithms.
Slavik Jablan's page "Are Borromean Links so Rare?"
MacTutor History of Mathematics Archive contains a
short biography of John Venn.
The Geometry Center at the University
Donald Knuth's online lectures are available at the Stanford
Center for Professional Development.
Robert Scharein's KnotPlot site. All pictures of knots on this
site were produced with KnotPlot.
Mark Thomson's page on