General Mathematics Resources

• The MacTutor History of Mathematics Archives
• CRC Concise Encyclopedia of Mathematics
• WWW Virtual Library: Mathematics (at Florida State University)
• The Math Forum (at Swarthmore)
• The Geometry Center (at the University of Minnesota)
• Mainly Mathematical Gateways (at University of Georgia)
• National Council of Teachers of Mathematics (NCTM) Standards Page (at The Math Forum)

Number Theory and Mathematical Proof Resources

• Number Theory Resources On-Line (at the MathArchives)
• Things of Interest to Number Theorists (at the Number Theory Web)
• Sloane's On-Line Encyclopedia of Integer Sequences (at AT&T)
• The Prime Page
• Fifteen Proofs of Euler's V-E+F=2 (at the Geometry Junkyard)
• Real Analysis (at Seton Hall)

Combinatorics and Probability Resources

• The Chance Project (includes several on-line courses)
• Introduction to Probability (at Dartmouth; this site includes an good introductory probability text and links to some wonderful applets).
• Probability Tutorial (at the University of Washington)
• Probability Lessons (at Brandeis)
• The Combinatorial Object Server (parts still under construction, but very cool)
• Dictionary of Combinatorics (Joe Fields' on-line edition)
• Arithmetic properties of Binomial Coefficients (at University of Georgia -- rather advanced but very interesting)

WWW Search Engines

by Altavista (Digital)
by Excite
by Infoseek
by InferenceFind
by Magellan
by Lycos
by WebCrawler
by Yahoo
by Google!