Catalan Conjecture Solved - The conjecture, which dates back to 1844, was recently proven by the Swiss mathematician Preda Mihailescu. Article by TAUNO METSANKYLA.
Catalan´s Conjecture - Summary of Problem and links to related articles by Eric W. Weisstein at Wolfram Research.
Catalan´s Conjecture - History of the Problem by Chris Caldwell at The Prime Glossary.
Math Soft Unsolved Math Problems - Site created by Steve Finch of Math Soft, Inc. "This evolving collection of unsolved mathematics problems is not systematic or complete
Millennium Prize Problems - In order to celebrate mathematics in the new millennium, The Clay Mathematics Institute of Cambridge, Massachusetts (CMI) has named seven "Millennium Prize Problems
