41. Some Open Problems www.oocities.com/xkey/unsolved/unsolved_problems.html Cachedunsolved problems!Nov 6, 2009 hi i have sent you two major problems happened in my Muraasil s chennel. And you have replied me saying that your team is working on to fix http://www.oocities.com/xkey/unsolved/unsolved_problems.html

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43. Unsolved Problems - About.com : Economics Unsolved Problems Cartoons and ComicsUnsolved Problems cartoons from the CartoonStock directory the world s largest on-line collection of cartoons and comics. http://economics.about.com/lr/unsolved_problems/313317/3/

44. Science For Truth - Omanforum here a list of unsolved problems http//en.wikipedia.org/wiki/unsolved_problems Again if no solution found in science, don t expect to find one in religion http://www.omanforum.com/forums/showthread.php?t=18064

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46. Template_talk:Unsolved_problems - By SriLankaDOT.com Aug 9, 2010 Sri Lanka Dot .Com provides you any thing your are looking for, We also maintain classified, Sri Lanka news, Sri Lanka picture gallery. http://www.srilankadot.com/wiki-Template_talk:Unsolved_problems

Sri Lanka Entertainment and Information Portal Home Sri Lanka Photos Sri Lanka Tube Sri Lanka News ... Food Recipes Members Login User ID Password Register Forgot password? Important Links India Tube Videos Property Sri Lanka Bollywood Cinema Online Bali Hotels ... Sri Lanka Hotels Mycities Network Template talk:Unsolved problems Template talk:Unsolved problems Template talk:Unsolved problems From Wikipedia, the free encyclopedia Jump to: navigation search Why isn't there an Unsolved Problems page for biology? talk ) 13:39, 14 January 2009 (UTC) Unsolved academic problems I suggest to rename the template title "Unsolved scientific problems" to "Unsolved academic problems" as arts and humanity fields like "Philosophy" and "Linguistics" has included in the list. —Preceding unsigned comment added by talk contribs ) 18:12, 9 August 2010 (UTC) Sri Lanka Entertainment and Information Portal by MyCities.Net Work Resources Top Link Exchange Join Sri Lanka Banner Exchange Link Exchange

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51. Unsolved Problems -- From Wolfram MathWorld There are many unsolved problems in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known) include 1. The Goldbach http://mathworld.wolfram.com/UnsolvedProblems.html

Algebra Applied Mathematics Calculus and Analysis Discrete Mathematics ... Unsolved Problems Unsolved Problems There are many unsolved problems in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known) include 1. The Goldbach conjecture 2. The Riemann hypothesis 3. The conjecture that there exists a Hadamard matrix for every positive multiple of 4. 4. The twin prime conjecture (i.e., the conjecture that there are an infinite number of twin primes 5. Determination of whether NP-problems are actually P-problems 6. The Collatz problem 7. Proof that the 196-algorithm does not terminate when applied to the number 196. 8. Proof that 10 is a solitary number 9. Finding a formula for the probability that two elements chosen at random generate the symmetric group 10. Solving the happy end problem for arbitrary 11. Finding an Euler brick whose space diagonal is also an integer. 12. Proving which numbers can be represented as a sum of three or four (positive or negative) cubic numbers Lehmer's Mahler measure problem and Lehmer's totient problem on the existence of composite numbers such that , where is the totient function 14. Determining if the

52. The Greatest Unsolved Problems In Science Presents some of the most challenging science questions in various fields of study. Includes further discussion on certain topics. http://www.jupiterscientific.org/sciinfo/gusp.html

Jupiter Scientific's List of The Greatest Unsolved Problems in Science (Please come back periodically as information will be added from time to time) A lot about the world has been learned during the past few centuries, but some mysteries still remain. Apparently, Nature has not revealed to us all her secrets but scientists are hard at work trying to decipher them. On August 28, 1999, National Public Radio's Science Friday program presented some of the greatest unsolved problems in science. Here is Jupiter Scientific's list. More detailed information will be provided in the coming months, so come back and find out more. In Astronomy: The Mystery of Dark Matter What Is Dark Matter? Astronomers have discovered that there is an amazing halo of mysterious invisible material that engulfs galaxies and clusters of galaxies. Astronomers have no idea what it is, and it composes about 95% of the mass of the Universe. If It's Invisible, Then How Does One Sense Its Existence? Astronomers have detected dark matter indirectly through its gravitational pull. For example, dark matter causes the stars in the outer regions of a galaxy to orbit faster than they would if there was only ordinary matter present.

53. UNSOLVED PROBLEMS AND REWARDS By Clark Kimberling. Offers prizes for solutions of some problems in number theory. http://faculty.evansville.edu/ck6/integer/unsolved.html

Unsolved Problems and Rewards Stated below are a few challenging problems. If you are first to publish a solution, let me know, and collect your reward! Or, if you find a short solution and you are quite sure it is correct and complete, send it to ck6@evansville.edu. If accepted, your proof will be published on this site - see, for example, Problem 8. 1. The Kolakoski Sequence: 122112122122112112212112122... This sequence is is identical to its own runlength sequence. Reward: $200.00 for publishing a solution of any one of the five problems stated in Integer Sequences and Arrays. The sequence originates in William Kolakoski , "Self generating runs, Problem 5304," American Mathematical Monthly 72 (1965) 674. For a proof that the Kolakoski sequence is not periodic, see the same Monthly See also Kolakoski Sequence at MathWorld 2. A Sequence Is every positive integer a term of this sequence: Reward: $300.00. To generate the sequence, visit Kimberling Sequence at MathWorld and Generator For a discussion and variant of the problem, see Richard K. Guy

54. Statistics IB A good collection. http://www.statslab.cam.ac.uk/~rrw1/research/unsolved.html

University of Cambridge Mathematics Statistical Laboratory Richard Weber Unsolved Problems in OR This page contains a list of open problems that I find intriguing. They are not as difficult or as significant as the question of whether P does or not equal NP. But these are problems that are easy to state and understand, but whose solution has defied the efforts of good researchers over a number of years. Most of these problems are in the realm of stochastic optimization. I would love to see a solution to any of these problems. The bomber problem See description The rendezvous problem See description Search for a moving target See abstract Non-preemptive release of stochastic jobs to uniform machines See abstract The unimportance of inserted idle time in non-preemptive stochastic scheduling to minimize flow time on parallel machines Information provided by webmaster@statslab.cam.ac.uk

55. Science And Reason: Unsolved Problems In Mathematics I just noticed this page in Eric Weisstein's excellent Mathworld site Unsolved Problems. It's a nice list of 16 problems in mathematics some of which date back two hundred years http://scienceandreason.blogspot.com/2006/08/unsolved-problems-in-mathematics.ht

var BL_backlinkURL = "http://www.blogger.com/dyn-js/backlink_count.js";var BL_blogId = "13156653"; Science and Reason Stuff for science nerds Tuesday, August 08, 2006 Unsolved problems in mathematics I just noticed this page in Eric Weisstein's excellent Mathworld site: Unsolved Problems . It's a nice list of 16 problems in mathematics some of which date back two hundred years or more that have defied the efforts of many mathematicians to find a solution. Everyone is familiar with the feeling, of course. Curiously, however, most of the problems concern number theory, in the general sense that they deal primarily with questions involving integers. More precisely, 11 of the 16, by my count. No doubt this is because such problems can be explained to anyone who knows what an integer is, without reference to any "higher" mathematics. I won't discuss them here, since the Mathworld site itself is an excellent encyclopedic reference to just about any topic in mathematics you might care to name. For that reason alone it's worth perusing the site if you aren't already familiar with it. Each problem, with related concepts, has its own page of explanation on the site. However, there's a hell of a lot of mathematics out there that's not concerned primarily with integers, and a correspondingly large number of unsolved problems. Does the site have more to say about such? Yes, it does. A little poking around reveals an index page:

56. Unsolved Problem Of The Week Archive A list of unsolved problems published by MathPro Press during 1995. http://cage.ugent.be/~hvernaev/problems/archive.html

Unsolved Problem of the Week Archive Welcome to the archive for the Unsolved Math Problem of the Week Each week, for your edification, we publish a well-known unsolved mathematics problem. These postings are intended to inform you of some of the difficult, yet interesting, problems that mathematicians are investigating. We give a reference so that you can get more information about the topic. These problems can be understood by the average person. Nevertheless, we do not suggest that you tackle these problems, since mathematicians have been unsuccessfully working on these problems for many years. Should you wish to discuss aspects of these problems with others, one of the newsgroups, such as sci.math , might be the appropriate forum. 3-Sep-1995 Problem 36 : Primes of the form n^n+1 27-Aug-1995 Problem 35 : Must one of n points lie on n/3 lines? 20-Aug-1995 Problem 34 : Squares with Two Different Decimal Digits 13-Aug-1995 Problem 33 : Unit Triangles in a Given Area 6-Aug-1995 Problem 32 : Can the Cube of a Sum Equal their Product 30-Jul-1995 Problem 31 : Different Number of Distances 23-Jul-1995 Problem 30 : Sum of Four Cubes 16-Jul-1995 Problem 29 : Fitting One Triangle Inside Another 9-Jul-1995 Problem 28 : Expressing 3 as the Sum of Three Cubes 2-Jul-1995 Problem 27 : Factorial that are one less than a Square 25-Jun-1995 Problem 26 : Inscribing a Square in a Curve 18-Jun-1995 Problem 25 : The Collatz Conjecture 11-Jun-1995 Problem 24 : Primes Between Consecutive Squares 4-Jun-1995 Problem 23 : Thirteen Points on a Sphere 28-May-1995

57. Homepage Overview This is a web site for amateurs interested in unsolved problems in number theory, logic, and cryptography. Please read the FAQ. How to use the site http://www.unsolvedproblems.org/

UNSOLVED PROBLEMS In Number Theory, Logic, and Cryptography Home Overview: This is a web site for amateurs interested in unsolved problems in number theory, logic, and cryptography. Please read the FAQ How to use the site: If you're new to the site, you may like to check out the Introduction . If you plan to be a regular visitor, you might like to bookmark the What's New page. Or go straight to any of the problems listed on the left-hand side. URL: The primary URL for the web site is http://www.unsolvedproblems.org/ Companion discussion group: There is a companion discussion group, http://tech.groups.yahoo.com/group/UnsolvedProblems/ , where questions can be asked and any of the problems or potential solutions discussed. How you can assist: If you find the site interesting, please let me know. If you would like to suggest any changes, or if you find any expired links, please let me know. Most of all, if there are other problems you'd like to see listed here, please let me know. And, of course, if you think you've solved any of the problems, please read the FAQ , and then let me know Contact information: Please email me This web site developed and maintained by Tim S Roberts Email: timro21@gmail.com

58. Unsolved Problems Here are some problems I tried but could not solve. They reflect only my personal taste and (lack of) mathematical abilities. I tried to avoid wellknown questions here, so http://www.math.wisc.edu/~nazarov/unsolved.html

59. Konrad Lorenz Institute For Ethology Austrian organization that investigates major unsolved problems in behavioral and evolutionary ecology. http://www.oeaw.ac.at/klivv/

Willkommen! Dieses Projekt verwendet Frames. Navigation Startseite

60. Talk:Electrical Engineering/Archive 2 - Wikipedia, The Free Encyclopedia The article also needs an improved lead and a summary of unsolved problems http://en.wikipedia.org/wiki/Talk:Electrical_engineering/Archive_2

Talk:Electrical engineering/Archive 2 From Wikipedia, the free encyclopedia Talk:Electrical engineering Jump to: navigation search This is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page Contents Suggestion #1 Suggestion #2 Survey Version 1 ... edit Suggestion #1 As the USA and Europe do have such a different views on the term electrical engineering, I suggest that this page now deal only with the items that are common betweeen US and Europe and that the other subjects are shown on another page (like electroncs engineering for instance). Could be done by links in text or 'See also's' at bottom of page. Could I have some reactions please from the other editors interested in this page? Light current 02:30, 21 November 2005 (UTC) edit Suggestion #2 In a further attempt at reconciliation between me and other editors interested in this page, I am prepared to make another conciliatory proposal. This is in fact the same proposal as User:C J Cowie made a few days ago in that there should only be one page called Electrical/electronic engineering (note I put electrical first as a goodwill gesture). If this page were to explain the differing terminologies between US and Europe, I think this could solve all our differences. I think Cedars' suggestion is retrograde and solves nothing.

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