Mathematical links
 The arXiv preprint
archive, and the UC Davis
front for same.
 MathSciNet
(requires subscription), an
online database for Mathematical Reviews.
 Some useful knot theory links:
The Knot
Atlas,
Table of Knot Invariants,
KhoHo, Knotscape.
 The Mandelbrot
competition, a great high school competition.
 The Stanford Math
Circle and Berkeley Math
Circle.
 The Mathematics Advanced Study Semesters
(MASS) program at Penn State University, which began in the fall of 1996.
 The American
Mathematics Competitions web page, containing information about the
AHSME/AIME/USAMO sequence, the International Math Olympiad, and the
Math Olympiad Program.
 The
AMC competitions archive and the
Putnam
archive.

Information about the
Math Olympiad
Program.
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