1. Unsolved Problems From MathWorld London Oliver Boyd, 1966. Ogilvy, C. S. Tomorrow s math unsolved problems for the Amateur, 2nd ed. New York Oxford University Press, 1972. http://mathworld.wolfram.com/UnsolvedProblems.html&e=747

2. Unsolved Problems References New York 1966. Ogilvy 1972 C. Stanley Ogilvy, Tomorrow s math unsolved problems for the Amateur. 2nd edition. Oxford University Press. New York 1972. http://cage.rug.ac.be/~hvernaev/problems/references.html&e=747

3. Unsolved Problems TomorrowÕs math unsolved problems for the amateur Charles Stanley Ogilvy Oxford University Press, New York 1962 Unknown binding. 182 pages. LCCN 62016577. http://www.mathpropress.com/mathBooks/UnsolvedProblems.html&e=747

4. Unsolved Problems unsolved problems. You can contact Stephen C. Locke at LockeS@fau.edu. Several people have asked me about unsolved problems. I will take the easy way out see the list of 50 problems in Bondy and Murty. 331 Phillips Hall, Chapel Hill, NC 275993250 (rpratt@math.unc.edu http://www.math.fau.edu/locke/unsolved.htm

Unsolved Problems You can contact Stephen C. Locke at LockeS@fau.edu Several people have asked me about unsolved problems. I will take the easy way out: see the list of 50 problems in Bondy and Murty . You can now see the list as it originally appeard in the the text, Graph Theory with Applications . (May, 2004: The authors are writing the next edition of the book.) Some of these problems have been solved (and thus the title is slightly incorrect) and I won't claim to be familiar with all current results. If you find that one of them has been solved (or even that some reasonable progress has been made), please e-mail me . Also, I'm not giving you all of the references in Bondy and Murty . You should get yourself a copy of that book (or look at the online version). Problems 26-56 Problems 57-61 Problems number above 50 on my list are from sources other than the Bondy and Murtry text. The reconstruction conjecture . (S.M. Ulam, 1960) 2. A graph G is embeddable in a graph H if G is isomorphic to a subgraph of H . Characterise the graphs embeddable in the k -cube. (V.V. Firsov, 1965)

5. Unsolved Problems Statements of some famous problems compiled by Frank Wikstrom, Ume� University. http://abel.math.umu.se/~frankw/unsolved.html

Mathematical research often concerns questions which are so abstract and technically complicated that only a small number of experts in that particular field can fully understand the problems and their significance. Therefore one is easily led to the conclusion that every problem is difficult to understand. This is not so. On this page I have gathered a handful of problems which to my knowledge and to this date are still unsolved although they can be understood by any one who has a working knowledge of, say, the high-school mathematics curriculum. Can every even integer number greater be written as the sum of two prime numbers? We have for example that: and so on, but is it true for every even number? Nobody knows, but most mathematicians seem to think that it is true. (The conjecture is known to be true for all even integers less than 20 000 000 000 or so. It is also known that every "sufficiently large" even integer can be written as the sum of a prime number and an integer with at most two prime factors.) Two consecutive odd numbers which are both prime are called twin primes, e.g. 5 and 7, or 41 and 43, or 1,000,000,000,061 and 1,000,000,000,063. But is there an infinite number of twin primes?

6. Unsolved Problems On a problem in formal logic. Engineering Phone (561) 2973350 Fax (561) 297-2436 Email LockeS@fau.edu URL http//www.math.fau.edu/locke/unsolved.htm http://www.math.fau.edu/locke/unsolved.htm&e=747

7. Unsolved Problems In Function Theory Notes by Alexandre Eremenko. http://www.math.purdue.edu/~eremenko/uns.html

My favorite unsolved problems GEOMETRIC FUNCTION THEORY AND POTENTIAL THEORY: ps pdf Some constants studied by Littlewood (Updated Oct 2002). ps pdf Exceptional set in Gross' Theorem. ps pdf "Hawaii Conjecture" (attributed to Gauss). ps pdf Does every universe contain a place where you can stay at rest? (Lee Rubel) ps pdf Erdos' problem on the length of lemniscates (at least $200 prize). DIFFERENTIAL EQUATIONS AND ITERATION IN THE COMPLEX DOMAIN: ps pdf Wandering domains of entire functions. TRANSCENDENTAL HOLOMORPHIC CURVES: ps pdf Modified Cartan's Conjecture. ps pdf Holomorphic curves with few inflection points. RATIONAL FUNCTIONS AND RATIONAL CURVES: ps pdf Rational curves with real inflection points (B. and M. Shapiro, for more info, see F. Sottile's page Other interesting items in this site: Progress report on some problems from Hayman's Collection When function theory became an obsolete subject? (Excerpt from a letter of Mittag-Leffler to Kowalevski.) What is mathematics? Some expert's opinions. jokes related to complex analysis some problems, whose solutions I do know (level: undergraduate+) stories about ODE, calculus and history

8. Unsolved Problems (Part 2) 1976),126130 Communicated to me by Christopher Heckman, checkman@math.gatech.edu found a simplified proof of the 4-Color Theorem ( unsolved Problem 37 and http://www.math.fau.edu/locke/unsolv2.htm&e=747

9. Open Problems List A collection of papers outlining unsolved problems in the field of dynamical systems. http://www.math.sunysb.edu/dynamics/open.html

Open Problems in Dynamical Systems Open problems in holomorphic dynamics Two lists of problems are currently available on-line: Conformal Dynamics Problem List Ed. by B. Bielefeld, IMS at Stony Brook Preprint 1990/1 and more recent Problems in Holomorphic Dynamics Ed. by B. Bielefeld and M. Lyubich, IMS at Stony Brook Preprint 92/7 In addition some open questions may be found in these surveys Open problems in dynamics in several complex variables is a part of Several complex variables problems list available from Several complex variables preprint server in Indiana. Please send your problems to Gregery Buzzard at gbuzzard@iu-math.math.indiana.edu Problems in Low-Dimensional Topology a 380 pages PostScript file edited by Rob Kirby contain some problems on Topological Dynamics. Topology of hyperbolic attractors. A problem submitted by Christian Bonatti. A collection maintained by Sergiy Kolyada and Michal Misiurewicz Is entropy effectively computable? A problem by John Milnor We are soliciting open problems in various areas of Dynamical Systems for posting on this page. You can post a problem by filling out this form or by sending an e-mail to webmaster@math.sunysb.edu

10. Mathsoft: Mathsoft Unsolved Problems math Resources. Welcome! This evolving collection of unsolved mathematics problems is not systematic or complete come to my attention over the years. unsolved problems on Other Sites http://www.mathsoft.com/mathresources/problems

search site map about us  + news  + ... Statistics Resources Unsolved Problems Mathsoft Constants Engineering Standards Engineering Links Math Resources Welcome! This evolving collection of unsolved mathematics problems is not systematic or complete; it is only an eclectic gathering of questions and partial answers which have come to my attention over the years. Unsolved Problems on Other Sites On a Generalized Fermat-Wiles Equation Zero Divisor Structure in Real Algebras Sleeping Habits of Armadillos ... contact us

11. Mathsoft: Mathsoft Unsolved Problems: Unsolved Problems On Other Sites in Prime Numbers Some unsolved problems, part of MacTutor History of Eremenko's Favorite unsolved problems ( Purdue University) Matt DeVos' Open problems in Discrete math ( Princeton http://www.mathsoft.com/mathresources/problems/article/0,,1999,00.html

search site map about us  + news  + ... Unsolved Problems Unsolved Problems Links On a Generalized Fermat-Wiles Equation Zero Divisor Structure in Real Algebras Sleeping Habits of Armadillos Mathsoft Constants ... Math Resources Unsolved Problems on Other Sites Jeff Lagarias' 3x+1 problem and related problems The Generalized 3x+1 Mapping (University of Queensland) and 1999 Conference on the Collatz Problem Proceedings Alex Lopez-Ortiz's sci.math FAQ on Famous Problems in Mathematics (University of New Brunswick) Chris Caldwell's Riemann Hypothesis (University of Tennessee at Martin); also Daniel Bump's Riemann Hypothesis (Stanford University) and Barry Cipra's A Prime Case of Chaos MathPro Press Unsolved Math Problem of the Week column and General References Twin Primes Conjecture and Goldbach's Conjecture, discussed in Prime Numbers: Some Unsolved Problems , part of MacTutor History of Mathematics (University of St Andrews); also Chris Caldwell's Prime Conjectures and Open Questions (University of Tennessee at Martin) Jan Otto Munch Pedersen's Known Amicable Pairs (Vejle Business College, Denmark) and Chris Caldwell's

12. Sci.math FAQ: Unsolved Problems sci.math FAQ unsolved problems. There are reader questions on this topic! Help others by sharing your knowledge http://www.faqs.org/faqs/sci-math-faq/unsolvedproblems

Usenet FAQs Search Web FAQs Documents ... RFC Index sci.math FAQ: Unsolved Problems There are reader questions on this topic! Help others by sharing your knowledge Newsgroups: sci.math alopez-o@neumann.uwaterloo.ca hv@cix.compulink.co.uk (Hugo van der Sanden): To the best of my knowledge, the House of Commons decided to adopt the US definition of billion quite a while ago - around 1970? - since which it has been official government policy. dik@cwi.nl (Dik T. Winter): The interesting thing about all this is that originally the French used billion to indicate 10^9, while much of the remainder of Europe used billion to indicate 10^12. I think the Americans have their usage from the French. And the French switched to common European usage in 1948. gonzo@ing.puc.cl alopez-o@barrow.uwaterloo.ca Rate this FAQ N/A Worst Weak OK Good Great Current Top-Rated FAQs Are you an expert in this area? Share your knowledge and earn expert points by giving answers or rating people's questions and answers! This section of FAQS.ORG is not sanctioned in any way by FAQ authors or maintainers. Questions strongly related to this FAQ: Choose 4 prime numbers such that adding the first of them equals the fourth, for example:...

13. Hilbert S Problems From MathWorld Hilbert s problems. A set of (originally) unsolved problems in mathematics proposed by Hilbert. mathematical Developments Arising from Hilbert problems. math. http://mathworld.wolfram.com/HilbertsProblems.html&e=747

14. Some Unsolved Problems Mainly in analysis. By J¶rg Winkelmann. http://www.math.unibas.ch/~winkel/problem.html

Some Mathematical Problems This is a collection of some mathematical questions, which I encountered somehow, mostly in the context of my own research. To my knowledge they are all unsolved. Of course, this is not a complete list of all unsolved problems in mathematics. For instance, I omitted those problems which everybody knows anyway (like the Jacobi conjecture). Furthermore the choice is made following my personal taste and prejudices. I certainly do not want to claim that these are the most important problems in today mathematics. Nevertheless, I am very curious about the problems listed below. If anybody is able to solve one or more or knows some results in these directions, please tell me. Does there exists a compact Riemann surface M of genus at least two which can be embedded into a quotient of SL C by a discrete cocompact subgroup? (This is a question raised by A.T.Huckleberry.) Remark: This question is discussed in my Book on parallelizable manifolds and some partial results are derived. In particular, such a curve can never arise as a zero-section of a rank two vector bundle. Let S be a complex semisimple Lie group

15. Unsolved Problems math problems, Games, and Puzzles math Miscellany. unsolved problems. unsolved problems. unsolved problems in Operations Research. unsolved Problem of the Week Archive. What Good is math http://www.spartanburg2.k12.sc.us/links/problems.htm

Math Problems, Games, and Puzzles Algorithmic Information Theory Brain Teasers Fermi Questions Library Ideas, Concepts, and Definitions ... What Good is Math?

16. Unsolved Problems and to this date are still unsolved although they last theorem, another easily formulated problem took more email any comments to Frank.Wikstrom@math.umu.se. http://abel.math.umu.se/~frankw/unsolved.html&e=747

17. Alexandre Eremenko Home Page Alexandre Eremenko (Purdue University). Mainly in analysis. http://www.math.purdue.edu/~eremenko/

Alexandre Eremenko picture Mathematics Department, Purdue University 150 N. University Street West Lafayette, IN 47907-2067 OFFICE: Math 612 PHONE: (765)494-1975, FAX: (765)494-0548 EMAIL: eremenko@math.purdue.edu vita Papers and Recent preprints (available in ps and pdf format) Some unsolved problems Some solved problems Stories and problems about ODE, calculus and history of science. CO-AUTHORS: A. Atzmon, A. Baernstein II, I. N. Baker, W. Bergweiler (3), V. Boichuk, M. Bonk J. Clunie, N. Eremenko, A. Fryntov, B. Fuglede, A. Gabrielov (5), Yu. Gaida, A. A. Goldberg (6), D. Hamilton, W. Hayman (4), J. Langley (2), L. Lempert, G. Levin (3), J. Lewis , T. Lyons, M. Lyubich S. Merenkov D. Novikov (2), I. Ostrovskii (3), M. Ostrovskii, M. Petrika, J. Rossi (2), L. Rubel (2), D. Shea, M. Sodin (16), A. Solynin. (My Erdos number: is 2). OTHER SITES Math. Journal Price Survey MAG journal (Kharkov) Joseph Fourier Portraits of Gauss Misha Gromov John Milnor ... Minimal surface Museum of Matthias Weber XXX archive (Los Alamos) Jahrbuch uber die Fortschritte der Mathematik Conference pictures

18. Mathsoft Mathsoft Unsolved Problems mathsoft Resources. Statistics Resources. unsolved problems. mathsoft Constants. Engineering Standards. Engineering Links. math Resources. Welcome! http://www.mathsoft.com/mathresources/problems/&e=747

19. Flooble :: Perplexus :: Logic Puzzles, Brainteasers, Riddles And Math Tricks puzzles, from simple logic questions and word tricks to indepth math problems like probability and geometry New Comments (14) unsolved problems. Top Rated problems. This month's top http://www.flooble.com/perplexus

All about flooble fun stuff Get a free chatterbox ... Avatars Notice: this site has moved to perplexus.info That's right - we now have our own new domain. These pages will eventually stop working, so please update your bookmarks! To access this page on the new site, go here: perplexus.info :: logic puzzles, brainteasers, riddles and math tricks (Your old login and password will still be valid on the new site) Home Welcome to perplexus.info , flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems! Categories All Problem Categories Latest: Sliding Puzzle (in General Here is one of the older sliding puzzles: You have a sliding puzzle that looks like this: AB C DE You may move a block with a letter on it to the blank space by sliding it there. How many moves does it take to put D where E is and E where D is at the same time? (The other pieces don't need to be in their original spots.)

20. Mathsoft Mathsoft Unsolved Problems Unsolved Problems On Other mathPro Press unsolved math Problem of the Week column and General References; Twin Primes Conjecture and Goldbach s Conjecture, discussed in Prime Numbers http://www.mathsoft.com/mathresources/problems/article/0,,1999,00.html&e=747

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