User:Noosfractal/Unsolved problems in mathematics

Unsolved problems

• Is the Euler-Mascheroni constant a rational number?
• Are there any odd perfect numbers?

Sites listing unsolved problems

• • article at mathworld http://mathworld.wolfram.com/UnsolvedProblems.html
• category page at mathworld http://mathworld.wolfram.com/topics/UnsolvedProblems.html
• http://directory.google.com/Top/Science/Math/Research/Open_Problems/
• The Open Problems Project http://maven.smith.edu/~orourke/TOPP/
• Kirby's 360 page list of open problems in Topology http://math.berkeley.edu/~kirby/
• Graph Theory and Combinatorics http://www.math.uiuc.edu/~west/openp/
• Open Problems Column Archive http://www.math.uiuc.edu/~west/pcol/pcolink.html
• Kimberling's Open Problems http://faculty.evansville.edu/ck6/integer/unsolved.html
• Eremenko's Open Problems http://www.math.purdue.edu/~eremenko/uns.html

• Eppstein's Open Problems in Geometry http://www.ics.uci.edu/~eppstein/junkyard/open.html
• Most wanted at mathpages.com http://www.mathpages.com/home/mwlist.htm

Books discussing unsolved problems

• . ISBN 156881111X. {{cite book}}: Missing or empty |title= (help); Unknown parameter |Author= ignored (|author= suggested) (help); Unknown parameter |Publisher= ignored (|publisher= suggested) (help); Unknown parameter |Title= ignored (|title= suggested) (help); Unknown parameter |Year= ignored (|year= suggested) (help)
• . ISBN 0387975063. {{cite book}}: Missing or empty |title= (help); Unknown parameter |Author= ignored (|author= suggested) (help); Unknown parameter |Publisher= ignored (|publisher= suggested) (help); Unknown parameter |Title= ignored (|title= suggested) (help); Unknown parameter |Year= ignored (|year= suggested) (help)
• . ISBN 0387208607. {{cite book}}: Missing or empty |title= (help); Unknown parameter |Author= ignored (|author= suggested) (help); Unknown parameter |Publisher= ignored (|publisher= suggested) (help); Unknown parameter |Title= ignored (|title= suggested) (help); Unknown parameter |Year= ignored (|year= suggested) (help)
• . ISBN 0883853159. {{cite book}}: Missing or empty |title= (help); Unknown parameter |Author= ignored (|author= suggested) (help); Unknown parameter |Publisher= ignored (|publisher= suggested) (help); Unknown parameter |Title= ignored (|title= suggested) (help); Unknown parameter |Year= ignored (|year= suggested) (help)
• . ISBN 187958574X. {{cite book}}: Missing or empty |title= (help); Unknown parameter |Author= ignored (|author= suggested) (help); Unknown parameter |Publisher= ignored (|publisher= suggested) (help); Unknown parameter |Title= ignored (|title= suggested) (help); Unknown parameter |Year= ignored (|year= suggested) (help)