81. Sensei's Library: Unsolved Problems Sensei's Library, page Unsolved Problems, keywords Problem. SL is a large WikiWikiWeb about the game of Go (Baduk, Weiqi). It's a collaboration and community site. Everyone can http://senseis.xmp.net/?UnsolvedProblems

82. Open Problems List A collection of papers outlining unsolved problems maintained at Stony Brook. 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

83. Tech Support, Manuals & Troubleshooting For Consumers Problems Solutions; Unsolved Problems; Top Products; Have an Expert Solve Your Problem Now! Click here to get instant support from one http://www.fixya.com/

84. Unsolved Problems Including the list of 50 problems of Bondy and Murty with current status. Compiled by Stephen C. Locke. http://www.math.fau.edu/locke/unsolved.htm

Unsolved Problems How to contact me 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 December 2007 : I have now received a copy of the new text, GTM 244. and the authors revisit these unsolved problems in Appendix A, and have increased the number of unsolved problems to 100. 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. ( How to contact me .) If I receive comments on these new problems, I will of course post those that seem suitable (and, at that point, I would presumably post the problem to which the comment refers). Note, however, the publisher does have a site for the text, http://blogs.springer.com/bondyandmurty/ , and it would seem reasonable that one should post comments there. Also, I'm not giving you all of the references in

85. Games On Graphs Students can understand and work on an unsolved problem in mathematics. http://www.c3.lanl.gov/mega-math/workbk/graph/grthree.html

Three for the Money: The Degree/Diameter Problem Description Students can understand and work on an unsolved problem in mathematics. There is a good chance that this problem can be solved by someone who spends enough time experimenting with it. The only skills required to work on it are the ability to draw dots and connect them with lines, and the understanding of four ideas related to graphs: degree diameter planarity , and size . (These concepts can be explored in the story Superperson Saves the Monster Materials Instructions Ideas for discussion Materials One large copy of the puzzle graph that all students can see, such as one that is drawn on the floor with masking tape, or a copy for each student or group of students. Paper and pencil should be handy so students can experiment and draw their own solutions to the problem. Instructions Explain to students that you are going to tell them about a problem in mathematics that is easy to understand that no one has solved yet. There is no reason why one of them could not be the person to solve it. A famous mathematician, Paul Erdos, has offered a large cash prize for the person who succeeds in drawing the graph that solves this problem. They could win it.

86. CiteULike: Unsolved Problems In Mathematical Systems And Control Theory by VD Blondel Cited by 32 - Related articles http://www.citeulike.org/user/corgan/article/6056393

Search all the public and authenticated articles in CiteULike. Enter a search phrase. You can also specify a CiteULike article id ( a DOI ( doi:10.1234/12345678 or a PubMed Id ( pmid:12345678 Click Help for advanced usage. CiteULike corgan's CiteULike Search Register Log in Home ... Research Fields NEW Help/FAQ Discussion Contact Us Library ... Recommendations NEW Neighbours Watchlist CiteULike is a free online bibliography manager. Register and you can start organising your references online. Tags Unsolved Problems in Mathematical Systems and Control Theory by: Vincent D. Blondel Alexandre Megretski RIS Export as RIS which can be imported into most citation managers BibTeX Export as BibTeX which can be imported into most citation/bibliography managers PDF Export formatted citations as PDF RTF Export formatted citations as RTF which can be imported into most word processors Delicious Export in format suitable for direct import into delicious.com. Setup a permanent sync to delicious) Formatted Text Export formatted citations as plain text To insert individual citation into a bibliography in a word-processor, select your preferred citation style below and drag-and-drop it into the document.

87. Unsolved Problems -- Problem Solving -- InformationWeek Business technologists often start working on problems before they know what the final answer will look like. In the movie industry, Sony is tackling the early stages of http://www.informationweek.com/news/global-cio/showArticle.jhtml?articleID=16090

88. Mathematician's Secret Room Unsolved problems in Number Theory. English and Japanese text by Hisanori Mishima. http://www.asahi-net.or.jp/~KC2H-MSM/mathland/overview.htm

Mathematician's Secret Room Challenges to Unsolved Problems in Number Theory Contents What's new (July 22, 2009) Chapter 0 : Opening - Why I am interested in Number Theory. Chapter 1 : 4/n = 1/a + 1/b + 1/c [D11] Chapter 2 : Squares consisted of 3 different digits [F24] Chapter 3 : n = (x + y + z)(1/x + 1/y + 1/z) Chapter 4 : n = x + y + z Chapter 5 : Repeating Decimals [A3] Chapter 6 : Additive Palindromicness of Natural Numbers [F32] Chapter 7 : Collatz's Conjecture [E16] Chapter 8 : Continued Fraction and Pell's Equation Chapter 9 : Amicable Numbers [B4][B5] Chapter 10 : Congruent Numbers (Congruum) [D27] Chapter 11 : Number Theoretic Algorithms [A3] [B45] [F10] Chapter 12 : Integer Factorization Algorithms Appendix 1 : WIFC (World Integer Factorization Center) Appendix 2 : Bibliography Appendix 3 : How to join in the Factorization Project Appendix 4 : Benchmark of Tomabechi's "ppmpqs.exe" Appendix 5 (new !) Prime table (Primes near to 2 n n , factorial, primorial and compositorial) [nn] denote the number in Richard K. Guy

89. CiteULike: Erdős On Graphs: His Legacy Of Unsolved Problems by FRK Chung Cited by 78 - Related articles http://www.citeulike.org/user/thegoose/article/3384475

Search all the public and authenticated articles in CiteULike. Enter a search phrase. You can also specify a CiteULike article id ( a DOI ( doi:10.1234/12345678 or a PubMed Id ( pmid:12345678 Click Help for advanced usage. CiteULike thegoose's CiteULike Search Register Log in Home ... Research Fields NEW Help/FAQ Discussion Contact Us Library ... Recommendations NEW Neighbours Watchlist CiteULike is a free online bibliography manager. Register and you can start organising your references online. Tags Erdős on Graphs: His Legacy of Unsolved Problems by: Fan R. K. Chung Paul Erdős Ronald L. Graham RIS Export as RIS which can be imported into most citation managers BibTeX Export as BibTeX which can be imported into most citation/bibliography managers PDF Export formatted citations as PDF RTF Export formatted citations as RTF which can be imported into most word processors Delicious Export in format suitable for direct import into delicious.com. Setup a permanent sync to delicious) Formatted Text Export formatted citations as plain text To insert individual citation into a bibliography in a word-processor, select your preferred citation style below and drag-and-drop it into the document.

90. Unsolved Problems Have patience. All things are difficult before they become easy (Moslik Saadi) Urgent problems in current programming languages that call for much rethinking http://lavape.sourceforge.net/doc/html/Unsolved.htm

Have patience. All things are difficult before they become easy Moslik Saadi Urgent problems in current programming languages that call for much rethinking 1. Programs should no longer be "written" It's time to finally overcome the antediluvian technology of software production using text editors. Programs should no longer be "written" but constructed/composed in Lego-like fashion from basic constructs, using structure editors rather than text editors. Particularly the executable portions of programs are the last bastions of textual programming that remain to be captured by "point-and-click" technology Structure editors are also a valuable and almost indispensable basis for the realization of powerful restructuring / refactoring operations, which should be supported by every modern IDE (Integrated Development Environment). Lava solution 2. "Interfaces" and "implementations" should be strictly separated Older, non-object-oriented languages like Modula-2 and Ada , that were based on "abstract data types", had already achieved a clean syntactic and semantic

91. Algebra.Com New UNsolved Problems - Feedage - 528106 Newly Submitted Unsolved Problems, By Feedage Forager, ID 528106, Grade 91, Type......Title Algebra.Com New UNsolved Problems, http://www.feedage.com/feeds/528106/algebracom-new-unsolved-problems

Search: Advanced Search All Feeds Podcasts Blogs Home Login Sign Up Blog ... Submit Feed 9,835,736 RSS Feeds and growing! Feedage Fora... Rating: 82 Member since: 2009-07-24 Feeds: 1 Share Subscribe: Algebra.Com New UNsolved Problems http://www.algebra.com/rss/unsolved_problems.rss Added By: Feedage Forager Language: English Tags: added click solve click favor ... unsolved Rate this Feed Comments (0) Feed Details and Statistics Sponsored Links: Problem Solve problem Problem added Click solve ... Solve Preview: Algebra.Com New UNsolved Problems Algebra.Com New UNsolved Problems Newly Submitted Unsolved Problems Published: 2010-10-31T08:09+00:00 Your Ad Here UNsolved problem 364055 added to Probability-and-statistics Click on the link to solve this problem: In favor Not in favor Not sure Northeast: In favor_68%; Not in favor_29%; Not sure_3% Midwest: In favor_69%; Not in favor_29%; Not sure_2% South: In favor_72%; Not in favor_23%; Not sure_5% West: In favor_80%; Not in favor_19%; Not sure_1% a. if three adults are selected at random from Northeast, what is the probability that all are in favor of the death penalty? UNsolved problem 364054 added to Quadratic_Equations Click on the link to solve this problem: Solve the formula for the indicated variable. I= E/R+r for R

92. Unsolved Problems - Wolfram Demonstrations Project Remember me Note Please do not include anything you consider confidential or proprietary. Your message and contact information may be shared with the author of any specific http://demonstrations.wolfram.com/topic.html?topic=Unsolved Problems&limit=2

93. Problem Unsolved RSS Feeds: Page 1 Sorted By Grade Com New UNsolved Problems, Subscribers 0, Feedage Grade A rated http://www.feedage.com/search/problem unsolved/1/4

Search: Advanced Search All Feeds Podcasts Blogs Home Login Sign Up Blog ... Submit Feed 9,835,736 RSS Feeds and growing! Quick Links Find RSS Feeds Search Advanced Search Browse Categories ... Share Categories Arts Animation japanese animation Antiques ... Wrestling Results for: problem unsolved RSS Feeds on: problem unsolved Items: 1 - 10 of 13 Sort by Alphabetical Most Popular Newest Grade Rating Most subscribed Algebra.Com New UNsolved Problems Subscribers: Newly Submitted Unsolved Problems Tags: click+solve click equations+click problem+added problem+unsolve problem solve+problem solve unsolved+problem unsolved Comments(0) http://www.algebra.com/rss/unsolved_problems.rss FixYa's Unsolved Problems Subscribers: Recent unsolved technical support problems provided by FixYa users. Tags: blank+tab doesn+work generator+running gfive+model leave+blank oldsmobile+regency paper+leave phone security+code switch unable+find Comments(0) http://feeds.feedburner.com/fixya/wgvY FixYa's Unsolved Problems Subscribers: Recent unsolved technical support problems provided by FixYa users. Tags: black+mgc black bottom+end bottom doors+uneven gas+cooktop lights mgc+gas motor+knock top+black turn+everthi uneven+top Comments(0) http://www.fixya.com/RSS/NewProblems/Index.aspx

94. Unsolved Problems In an age where scientific discovery is everyday news, there are in fact problems which have never been solved. http://hypography.com/topics/unsolvedproblems.cfm

95. Unsolved Problems Unsolved Problems. Does there exist a number that is perfect and odd? A given number is perfect if it is equal to the sum of all its proper divisors. http://www.cs.uwaterloo.ca/~alopez-o/math-faq/mathtext/node30.html

Next: Mathematical Games Up: Famous Problems in Mathematics Previous: Which are the 23 Unsolved Problems Does there exist a number that is perfect and odd? A given number is perfect if it is equal to the sum of all its proper divisors. This question was first posed by Euclid in ancient Greece. This question is still open. Euler proved that if N is an odd perfect number, then in the prime power decomposition of N , exactly one exponent is congruent to 1 mod 4 and all the other exponents are even. Furthermore, the prime occurring to an odd power must itself be congruent to 1 mod 4. A sketch of the proof appears in Exercise 87, page 203 of Underwood Dudley's Elementary Number Theory. It has been shown that there are no odd perfect numbers Collatz Problem Take any natural number n : = m; repeat n is odd) then n : = 3*n + 1 ; else n : = n/2 until ( n==1 Conjecture 1. For all positive integers m, the program above terminates. The conjecture has been verified for all numbers up to References Unsolved Problems in Number Theory.

96. Unsolved Problems (Part 2) 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. I hope it will not annoy the authors of http://math.fau.edu/locke/Unsolv2.htm

Unsolved Problems (Part 2) How to contact me 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 . I hope it will not annoy the authors of that text if I will reproduce that list here, and perhaps (eventually) add to it. Problems number above 50 are from other sources. 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. ( How to contact me .) Also, I'm not giving you all of the references in Bondy and Murty . You should get yourself a copy of that book. Problems 1-25 Problems 57-61 26. Prove that every n -chromatic graph G has r(G,G) >= r(n,n) Message from Stephan Brandt Disproved by Faudree and McKay [ J. Comb. Math. Comb. Comp. 13 Counterexample: Wheel with 5 spokes has Ramsey number 17 < r(4,4). 27. What is the maximum possible chromatic number of a graph which can be drawn in the plane so that each edge is a straight line segment of unit length? (Moser, 1958)

97. ISMRM 14th Scientific Meeting & Exhibition Jun 24, 2008 Unsolved Problems and Unmet Needs in Magnetic Resonance The submission deadline and procedure for these unsolved problems abstracts is http://www.ismrm.org/06/UnsolvedCall06.htm

Seattle, Washington, USA 6-12 May 2006 A New Course with a Special Call for Papers Last updated 24 June 2008 Unsolved Problems and Unmet Needs in Magnetic Resonance Call for Abstracts: Submission Deadline: 9 December 2005 The submission deadline and procedure for these "unsolved problems" abstracts is separate from those of the regular ISMRM abstracts. Please note that abstracts submitted for this course may not also be submitted for presentation in the regular scientific sessions. We are pleased to announce a new initiative to be launched at the 2006 ISMRM meeting in Seattle, to highlight unsolved problems and unmet needs in magnetic resonance. Online submissions on important problems and needs will be solicited, and approximately ten of these submissions will be selected for presentation over the course of four mornings. The submission deadline and procedure for these “unsolved problems” abstracts will be separate from those of regular ISMRM abstracts Background: The field of magnetic resonance is increasingly rich and diverse, spanning far too many areas of clinical and research activity for any one person or group to track effectively. At the annual ISMRM meeting and in many of our professional interactions, we tend to focus on what we or others have recently accomplished in our areas of interest, or else we speculate together on current trends and promising future directions in MR research and practice. In the midst of all this lively and topical activity, the less satisfying questions of what we

98. Dorabella UNSOLVED PROBLEMS The Dorabella cipher is contained in a note written by the English composer Sir http://unsolvedproblems.org/index_files/dorabella.htm

UNSOLVED PROBLEMS In Number Theory, Logic, and Cryptography Dorabella Cipher The Dorabella cipher is contained in a note written by the English composer Sir Edward Elgar to a young lady companion, Dora Penny, in 1897. The cipher remains unsolved to this day. The problem is to solve the cipher. For further information, please see: http://en.wikipedia.org/wiki/Dorabella_Cipher http://www.geocities.com/Vienna/4056/cipher.html http://homepage.mac.com/turder/iblog/B561081935/C663716685/E538429514/index.html The Dorabella Cipher has now been solved.  See item 12 on the Solutions page. This web site developed and maintained by Tim S Roberts Email: timro21@gmail.com * There are currently 2 proposed solution on the solutions page.

99. Open Problems For Undergraduates A collection of open problems in Discrete Mathematics which are currently being researched by members of the DIMACS community. http://dimacs.rutgers.edu/~hochberg/undopen/

Open Problems for Undergraduates Open Problems by Area Graph Theory Combinatorial Geometry Geometry/Number theory Venn Diagrams Inequalities Polyominos This is a collection of open problems in Discrete Mathematics which are currently being researched by members of the DIMACS community. These problems are easily stated, require little mathematical background, and may readily be understood and worked on by anyone who is eager to think about interesting and unsolved mathematical problems. Some of these problems are quite hard and have been open for a long time. Others are newer. For further information on a particular problem, you may write to the associated researcher. Although these problems are intended for undergraduates, it is expected that high school students, teachers, graduate students and professional mathematicians will be drawn to this collection. This is not discouraged. Each of these problems is associated with some member of DIMACS. If you have any questions, comments, insights or solutions, please send email to the researcher who is listed with the problem. These pages are maintained by Robert Hochberg Last modified Feb. 5, 1997.

100. Plane Geometry - Rapidshare Search - Rapid4search.com rapidshare.com/files/3VF_ef000f2fe6de6d4a03e9/11 Victor Klee Stan Waqon Old and New Unsolved Problems in Plane Geometry and Number Theory.zip http://www.rapid4search.com/plane_geometry/page1/en

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