21. Unsolved Problems unsolved problems. In an age where scientific discovery is everyday news, there are in fact problems which have There are actually so many unsolved problems in all areas of science http://www.hypography.com/topics/unsolvedproblems.cfm

Ads_kid=0;Ads_bid=0;Ads_xl=0;Ads_yl=0;Ads_xp='';Ads_yp='';Ads_opt=0;Ads_wrd='';Ads_prf='';Ads_par='';Ads_cnturl='';Ads_sec=0;Ads_channels='Pop'; Ads_kid=0;Ads_bid=0;Ads_xl=468;Ads_yl=60;Ads_xp='';Ads_yp='';Ads_opt=0;Ads_wrd='';Ads_prf='';Ads_par='';Ads_cnturl='';Ads_sec=0;Ads_channels='Full'; Home News Science Forums Hypographies ... Science Shop Sunday, 6 June 2004 Hypography Science sites Amazon.com Hypographies Unsolved Problems In an age where scientific discovery is everyday news, there are in fact problems which have never been solved. Created by Tormod Guldvog Last updated September 14 2001 There are actually so many unsolved problems in all areas of science, that the task of creating a complete list of them would in fact be another unsolved problem. Many of these problems are well documented on the Internet. This hypography features web directories which have collected problems in areas like mathematics, astrophysics, physics and cosmology. Related Links The Geometry Junkyard: Unsolved Problems A list of unsolved problems in geometry. Review: Tormod link details Geometry Prime Conjectures and Open Questions Some unsolved prime number problems.

22. Unsolved Problems In Physics - Wikipedia, The Free Encyclopedia unsolved problems in physics. From Wikipedia, the free encyclopedia. The following are some of the unsolved problems in physics. http://en.wikipedia.org/wiki/Unsolved_problems_in_physics

Unsolved problems in physics From Wikipedia, the free encyclopedia. The following are some of the unsolved problems in physics . This is an incomplete list of outstanding problems in physics . Some of these problems are theoretical , meaning that existing theories seem incapable of explaining some observed phenomenon or experimental result. Others are experimental , meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail. Accretion disc jets. Why do the accretion discs surrounding certain astronomical objects, such as the nuclei of active galaxies , emit radiation jets along their polar axes? Amorphous solids . What is the nature of the transition between a fluid or regular solid and a glassy phase ? What are the microscopic physics giving rise to the general properties of glasses? Dark matter . How is it generated? What is its relation to the expansion of the universe? Fusion power . Is it possible to construct a practical nuclear reactor that is powered by the nuclear fusion rather than nuclear fission Galaxy rotation problem . Why do galaxies rotate at speeds inconsistent with their apparent mass Gamma ray bursters . What is the nature of these extraordinarily energetic astronomical objects?

23. Talk:Unsolved Problems In Biology - Wikipedia, The Free Encyclopedia Talkunsolved problems in biology. From Wikipedia, the free encyclopedia. unsolved problems are important. ping 0721, 27 Feb 2004 (UTC); Delete. http://en.wikipedia.org/wiki/Talk:Unsolved_problems_in_biology

Talk:Unsolved problems in biology From Wikipedia, the free encyclopedia. If this page is going to exist, shouldn't we remove the questions that do have answers? Here is my short list: Why is it necessary for mammals to sleep? Or dream, come to that? - plenty of answers to this one What is consciousness? - plenty of answers to this from a biological standpoint but the real questions don't belong here but in metaphysical Do the genomes of all animals link together? - I could swear there is a complete tree of all animals that answers this already. Texture 20:15, 26 Feb 2004 (UTC) Are they really solved problems? I'm not sure about the sleep thing ... and consciousness and genomes are iffy as to being "solved" .... mabey more research could help to see if these are "settled" ... I think there is still a general debate on those points (but I could be wrong) ... "plenty of answers" isn't reason to remove the points ... there are "plenty of answers" to the physics questions, but they are still unsolved Sincerely, JDR [PS. I tried to reformat the pg to reflect the frmt of the otehr like pages]

24. Open Problems On Perfect Graphs unsolved problems on perfect graphs. http://www.cs.rutgers.edu/~chvatal/perfect/problems.html

PERFECT PROBLEMS Created on 22 August, 2000 Last updated on 11 February, 2003 In May 2002, the Strong Perfect Graph Conjecture became the Strong Perfect Graph Theorem Details are here. As a part of the 1992 1993 Special Year on Combinatorial Optimization at DIMACS ftp://dimacs.rutgers.edu/pub/perfect/problems.tex If you have information on progress towards solving these problems or complaints in case I did not give credit where credit was due or suggestions for problems to add, please, send them to me Related pages: Problems from the AIM Workshop on Perfect Graphs (compiled by Maria Chudnovsky) A bibliography on perfect graphs Home pages of people interested in perfect graphs This collection is written for people with at least a basic knowledge of perfect graphs. Uninformed neophytes may look up the missing definitions on the web in Alexander Schrijver's lecture notes or in Jerry Spinrad's draft of a book on efficient graph representations etc. or in Eric Weisstein's World of Mathematics . Books on perfect graphs include M. C. Golumbic

25. 2nd International Conference On: Unsolved Problems Of Noise And Fluctuations (UP 2nd International Conference on unsolved problems of Noise (UPoN 99). and fluctuations in physics, high technology, information technology, biology . http://www.eleceng.adelaide.edu.au/Personal/dabbott/UPoN/uponhome.html

2nd International Conference on: Unsolved Problems of Noise (UPoN '99) and fluctuations in physics, high technology, information technology, biology.... 11-15th July 1999 ADELAIDE, AUSTRALIA Conference Director: Derek Abbott Technical Program Director: Laszlo B. Kiss Keynote Speaker SPONSORED BY: Inst. of Electrical and Electronic Eng. (IEEE) - USA Electron Devices Society (EDS) - USA US Office of Naval Research Field Office Asia (ONRIFO Asia) US Air Force Office of Scientific Research - Asian Office of Aerospace Research and Development (AFOSR-AOARD) ... Centre for Biomedical Engineering (CBME) - Proceedings published by: American Institute of Physics Welcome to UPoN '99 UPoN '99 Photo gallery Feedback: what people thought of UPoN'99 ... About The Solar System host for UPoN '99 Enquiries to: Dr. Derek Abbott Conference Director UPoN '99 Secretariat EEE Dept University of Adelaide SA 5005, AUSTRALIA. dabbott@eleceng.adelaide.edu.au Ph: +618-8303-5748 Fx: +618-8303-4360 Page hits before May 1999: 2348 Page hits since May 1999: Updated: 3rd July 1999

26. Unsolved Problems Some Simple unsolved problems. One of the things that turned me on to math were some simple sounding but unsolved problems that were http://www.math.utah.edu/~alfeld/math/conjectures.html

Understanding Mathematics by Peter Alfeld, Department of Mathematics, University of Utah Some Simple Unsolved Problems One of the things that turned me on to math were some simple sounding but unsolved problems that were easy for a high school student to understand. This page lists some of them. Prime Number Problems To understand them you need to understand the concept of a prime number A prime number is a natural number greater than 1 that can be divided evenly only by 1 and itself. Thus the first few prime numbers are You can see a longer list of prime numbers if you like. The Goldbach Conjecture. Named after the number theorist Christian Goldbach (1690-1764). The problem: is it possible to write every even number greater than 2 as the sum of two primes? The conjecture says "yes", but nobody knows. You can explore the Goldbach conjecture interactively with the Prime Machine applet.

27. MathPages Wanted List Elementary unsolved problems in mathematics, listed at the MathPages archive. http://mathpages.com/home/mwlist.htm

MathPages Wanted List The twenty-four mathematical problems and questions listed below have been studied by numerous people since they were first posted on the internet in 1995. In that time, Problems 1, 5, 7, 8, and 22 have been solved completely, and part of Question 12 has been answered. The other eighteen problems remain unsolved. The links in this list point to articles on the MathPages web site containing more background on each problem, and partial or related results. (1) Prove or disprove that there cannot be distinct colinear arrangements of points with the same multi-set of point-to-point distances. (Reflections are not counted as distinct.) Ref: Distinct Point Sets With Same Distances Variations and Comments on Problem 1 Relation to Golomb Rulers Generating Functions for Point Set Distances SOLVED: 4 Apr 97. Dan Hoey forwarded a couple of messages from John Scholes and Torsten Sillke each giving an example of isospectral sets in one dimension. (2) Find an elementary proof that x^2 + y^2 and x^2 + 103y^2 cannot both be squares for non-zero integers x,y. Ref:

28. Links To Open Problems In Mathematics, Physics And Financial Econometrics Lists of unsolved problems Long standing open problems and prizes P versus NP The Hodge Conjecture The Poincaré Conjecture The Riemann Hypothesis YangMills http://www.geocities.com/ednitou/

OPEN QUESTIONS April 13th, 2004 MATHEMATICS Lists of unsolved problems Long standing open problems and prizes P versus NP The Hodge Conjecture The Poincaré Conjecture The Riemann Hypothesis Yang-Mills Existence and Mass Gap Navier-Stokes Existence and Smoothness The Birch and Swinnerton-Dyer Conjecture Mathworld list Mathematical challenges of the 21st century including moduli spaces and borderland physics Goldbach conjecture Normality of pi digits in an integer base Unsolved problems and difficult to understand areas Related links Sir Michael Atiyah's Fields Lecture (.ps) Difficult to understand areas: long to learn: quantum groups motivic cohomology , local and micro local analysis of large finite groups, exotic areas: infinite Banach spaces , large and inaccessible cardinals Polynomial-time algorithm determining if a number is prime Number theory and physics Conjectured links between the Riemann zeta function and chaotic quantum-mechanical systems Deep and relatively recent ideas in mathematics and physics Standard model and mathematics: Gauge field or connection Dirac operators or fundamental classes in K-theory (Atiyah-Singer index theorem) String theory and mathematics: Mirror symmetry Conformal field theory Mathematics behind supersymmetry Mathematics of M-Theory Unified theory: Langlands Program , Theory of "motives"

29. Unsolved Problems In Mathematics unsolved problems in Mathematics. Poincare Conjecture $1,000,000 US for a solution! How many 3D simple surfaces exist Goldbach http://www.geocities.com/ResearchTriangle/System/8956/Unsolved/

Unsolved Problems in Mathematics Poincare Conjecture - $1,000,000 US for a solution! How many 3D simple surfaces exist... Goldbach Conjecture - Can every number be written as a pair of primes... Twin Prime Problem - How many primes have a twin... Integer Brick Problem - Can there be a triplet of triplets...

30. Unsolved Problems unsolved problems. Erdos on Graphs His legacy of unsolved problems Fan RK Chung and Ronald L. Graham AK Peters, Wellesley, MA 1998 Hardcover. 142 pages. http://www.mathpropress.com/mathBooks/UnsolvedProblems.html

Unsolved Problems Algebraic GeometryOpen Problems C. Ciliberto Springer-Verlag , Berlin: 1983 Paperback. 411 pages. ISBN 0-387-12320-2 LCCN 83-012390 Continua: With the Houston Problem Book Volume 170 of the series Lecture Notes in Pure and Applied Mathematics Howard Cook, W. T. Ingram, and K. T. Kuperberg Marcel Dekker, City of publication unknown: 1995 Paperback. 402 pages. ISBN 0-8247-9650-0 Definitions, Solved and Unsolved Problems, Conjectures, and Theorems in Number Theory and Geometry Florentin Smarandache Xiquan Publishing House, City of publication unknown: 2000 Paperback. 84 pages. ISBN 1-879585-74-X Erdos on Graphs: His legacy of unsolved problems Fan R. K. Chung and Ronald L. Graham A K Peters, Wellesley, MA: 1998 Hardcover. 142 pages. ISBN 1-56881-079-2 LCCN 97-046327 Mathématiques de demain, problèmes non résolus Charles Stanley Ogilvy Dunod, Paris: 1966 Unknown binding. 152 pages. French. LCCN 72-381436 Old and New Unsolved Problems in Plane Geometry and Number Theory Volume 11 of the series Dolciani mathematical expositions Victor Klee and Stan Wagon Mathematical Association of America , Washington, DC: 1991 Hardcover. 333 pages. ISBN 0-88385-315-9 LCCN 91-061591

31. Sci.math FAQ: Unsolved Problems sci.math FAQ unsolved problems. There are reader questions on this topic! References unsolved problems in Number Theory. Richard K Guy. Springer, Problem E16. 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: what are some unsolved problems by Dylan McDonald (11/3/2003) Choose 4 prime numbers such that adding the first of them equals the fourth, for example:...

32. What Are Some Unsolved Problems - Q&A unsolved problems. mentioned in these posts. Back to sci.math FAQ unsolved problems. © 2003 FAQS.ORG. All rights reserved. http://www.faqs.org/qa/qa-6896.html

...unsolved problems Internet RFC Index Usenet FAQ Index Other FAQs Documents Search Search FAQs Home Answered Questions Question by Dylan McDonald Submitted on 11/3/2003 Related FAQ: sci.math FAQ: Unsolved Problems Rating: Not yet rated Rate this question: N/A Worst Weak OK Good Great what are some unsolved problems Your answer will be published for anyone to see and rate. Your answer will not be displayed immediately. If you'd like to get expert points and benefit from positive ratings, please create a new account or login into an existing account below. Your name or nickname: If you'd like to create a new account or access your existing account, put in your password here: Your answer: Check spelling FAQS.ORG reserves the right to edit your answer as to improve its clarity. By submitting your answer you authorize FAQS.ORG to publish your answer on the WWW without any restrictions. You agree to hold harmless and indemnify FAQS.ORG against any claims, costs, or damages resulting from publishing your answer. FAQS.ORG makes no guarantees as to the accuracy of the posts. Each post is the personal opinion of the poster. These posts are not intended to substitute for medical, tax, legal, investment, accounting, or other professional advice. FAQS.ORG does not endorse any opinion or any product or service mentioned mentioned in these posts.

33. Andrew's Fibonacci Unsolved Problems Unsolved Fibonacci Problems. unsolved problems 1) Are there infinitely many prime Fibonacci numbers ? 2) Are 1, 8 and 144 the http://alas.matf.bg.ac.yu/~mm97106/math/fibo/unfib.htm

Unsolved Fibonacci Problems Unsolved Problems : 1) Are there infinitely many prime Fibonacci numbers ? 2) Are 1, 8 and 144 the only powers Fibonacci numbers ? 3) Are there F(p^2)=1 (mod p^2) for some p- prime ? Solved : 4) The only square Fibonacci numbers are 1 and 144 ! 5) The only cubic Fibonacci numbers are 1 and 8 ! 6) The only triangular Fibonacci numbers are 1,3,21 and 55 ! 7) The only square Lucas numbers are 1 and 4 ! 8) The only cubic Lucas number is 1 ! 9) The only triangular Lucas numbers are 1,3 and 5778 ! References: Neville Robbins, Beginning Number Theory. Wm.C.Brown publishers.Dubuque,Iowa:1993,Page 289 www.mathpro.com www-groups.dcs.st-and.ac.uk Powers is special case for question 3) Look Fibonacci Powers Very old conjecture (at least 1967) Find Fibonacci numbers divisible by p^2 Fibonacci Conjecture Fibonacci powers J.H.E.Cohn proved in 1963. John H.E.Cohn, "On Square Fibonacci Numbers" The Journal of The London Mathematical Society Vol.39, 537-540, 1964.

34. Unsolved Problems unsolved problems. 1. Can someone solve this integral equation? Find a nonnegative function g defined on 0,1 and a constant a satisfying. http://www.maths.usyd.edu.au:8000/u/richardc/unsolved.html

Unsolved problems 1. Can someone solve this integral equation? Find a non-negative function g defined on [0,1] and a constant a satisfying Motivation for the equation, together with a series-solution and plot, is given in Section 5 of Cowan, R. and Chen, F. K. C. Four interesting problems concerning Markovian shape sequences. Adv. Appl. Prob. Download post-script file. The equivalent differential equation is also given in this paper. An analytic solution would be desirable. Least dense "full" packings. Consider an infinite ensemble of equal-sized disks with diameter 1, packed together in the plane. A requirement of the packing is that each disk touches at least 4 other disks. In addition, each disk's circumference must be "full" in the sense that the angle at the disk's centre subtended by the centres of any two adjacent neighbours is less than 2 p /3. Thus there is no room on the circumference for another disk. In the paper Cowan, R. Constraints on the random packing of disks. J. Appl. Prob.

35. Blondel, V.D. And Megretski, A., Eds.: Unsolved Problems In Mathematical Systems of the book unsolved problems in Mathematical Systems and Control Theory by Blondel, VD and Megretski, A., eds., published by Princeton University...... http://pup.princeton.edu/titles/7790.html

PRINCETON University Press SEARCH: Keywords Author Title More Options Power Search Search Hints E-MAIL NOTICES NEW IN PRINT E-BOOKS ... HOME PAGE Unsolved Problems in Mathematical Systems and Control Theory Edited by Vincent D. Blondel and Alexandre Megretski Shopping Cart Endorsements This book provides clear presentations of more than sixty important unsolved problems in mathematical systems and control theory. Each of the problems included here is proposed by a leading expert and set forth in an accessible manner. Covering a wide range of areas, the book will be an ideal reference for anyone interested in the latest developments in the field, including specialists in applied mathematics, engineering, and computer science. The book consists of ten parts representing various problem areas, and each chapter sets forth a different problem presented by a researcher in the particular area and in the same way: description of the problem, motivation and history, available results, and bibliography. It aims not only to encourage work on the included problems but also to suggest new ones and generate fresh research. The reader will be able to submit solutions for possible inclusion on an online version of the book to be updated quarterly on the Princeton University Press website, and thus also be able to access solutions, updated information, and partial solutions as they are developed. Vincent D. Blondel

36. Bahcall, J.N. And Ostriker, J.P., Eds.: Unsolved Problems In Astrophysics. of the book unsolved problems in Astrophysics by Bahcall, JN and Ostriker, JP, eds., published by Princeton University Press....... http://pup.princeton.edu/titles/5988.html

PRINCETON University Press SEARCH: Keywords Author Title More Options Power Search Search Hints E-MAIL NOTICES NEW IN PRINT E-BOOKS ... HOME PAGE Winner of the 1999 Henry Norris Russell Lectureship sponsored by the American Astronomical Society Unsolved Problems in Astrophysics Edited by John N. Bahcall and Jeremiah P. Ostriker Shopping Cart Reviews Table of Contents The field of astrophysics is in the midst of a technologically driven renaissance, as fundamental discoveries are being made with astonishing frequency. In the last decade, new detectors in space, on earth, and deep underground have, when coupled with the computational power of modern computers, revolutionized our knowledge and understanding of the astronomical world. This is a great time for a student of any age to become acquainted with the remarkable universe in which we live. This volume is a collection of essays, originally presented orally to a diverse group of students and professionals, which reveal the most fertile areas for future study of astronomy and astrophysics. The emphasis of this work is on the clear description of the current state of our knowledge as a preparation for the future unraveling of the mysteries of the universe that appear today as most fundamental and most amenable to solution. A stellar group of astronomers and astrophysicists describes the directions and styles of work that they think are most likely to lead to progress. Bibliographical notes at the end of each presentation provide guidance for the reader who wishes to go more deeply into a given subject.

37. Unsolved Problems unsolved problems. We have stressed already unsolved problems are numerous in the field of chronobiology. The highest priority in http://bioclox.bot.biologie.uni-tuebingen.de/Html_we/english/Books/ren96/ren96/n

Next: Recording methods Up: Scientific work Previous: Controversies in science Unsolved problems We have stressed already in the introduction, that many problems in the natural sciences are unsolved and that we are far from understanding the nature around us. One of the main goals of science is, to reduce ignorance and superstition of mankind. Unsolved problems are numerous in the field of chronobiology. The highest priority in the list of unsolved problems is the search for the mechanism of biological rhythms. In no case this question has been answered satisfactorily at the physiological safe at the molecular level. A number of models exist [ ] which are, however, all unsatisfactory or wrong. New methods to clarify the mechanisms involved come from the field of molecular biology and systems analysis. Important in this respect are not only the methods, but also the systems studied. It is recommendable to use a minimal system, which shows the property to be studied, but exhibits only few phenomena which might disturb the studies. In trying to unravel the mechanism of circadian rhythms a prokaryote would be more suitable as compared to a eukaryote: The former is much more primitive in respect to structure and function. The genetical structures are extremely simple, consisting of a ring-shaped chromosome without nucleus. Organelles and compartments are absent. New molecular genetic methods can be used [

38. Hilbert's 23 Unsolved Problems Back to the Table of Contents Topics Hilbert s 23 unsolved problems. 19. Analyze the analytic character of solutions to variational problems. ? Unsolved. 20. http://www.andrews.edu/~calkins/math/biograph/199899/tophilpr.htm

Back to the Table of Contents Topics - Hilbert's 23 Unsolved Problems In 1900, David Hilbert addressed the International Congress of Mathmaticians in Paris. In the address, he outlined 23 major mathematical problems that would be studied in the next century. The address was not only a collection of problems, it was also his philosophy of mathematics and problems important to that philosophy. Hilbert's Address Problem Proven True/False/? Comments 1a. Is there a transfinite number between that of a Denumerable Set and the numbers of the Continuum True/False This question was answered by and Cohen to the effect that the answer depends on the particular version of Set Theory assumed. 1b. Can the Continuum of numbers be considered a Well-Ordered Set This question is related to Zermelo's Axiom of Choice which was demonstrated in 1963 to be independent of all other axioms in Set Theory . There is no universally valid solution. 2. Can the axioms of logic be proven to be consistent? False Any formal system interesting enough to fomulate its own consistency can prove its own consistency if and only if it is inconsistent, derived from 3. Are there two tetrahedra which cannot be decomposed into congruent tetrahedra directly or by adjoining congruent tetrahedra.

39. UnSolved Problems In 'PUZZLE FUN' PUZZLE FUN top page. unsolved problems in PUZZLE FUN Follow unsolved problems from back issues of my magazine PUZZLE FUN. Try to http://anduin.eldar.org/~problemi/pfun/pfununso.html

PUZZLE FUN top page UnSolved problems in PUZZLE FUN Follow UnSolved Problems from back issues of my magazine PUZZLE FUN Try to solve some problem that no one solve and send me Your, possibly partial, solutions. Your name, if you like, will appear here and in the journal!! Cheer, Rodolfo M. Kurchan PUZZLE FUN Editor PUZZLE FUN Is it possible to make a rectangle that use the 12 pentominoes that have at least 1 single, 1 double, 1 triple and 1 cuadruple?. Michael Reid found a closer solution to this problem using 10 pentominoes:1 single, 5 doubles, 3 triples and 1 quadruple: 320 = 15 x 39. Can someone find a solution using more pentominoes? PUZZLE FUN Ramps pentominoes A ramp is a road of pieces between an horizontal line and a vertical line. Double and Triple Fence Probelms "Double fence" means that the fence should be double in all directions (i.a.d.: horizontal, vertical and diagonal). h.a.v cases will only requiere double horizontal and vertical directions. Find the biggest ramp with double fence h.a.v. symmetric (inside and outside border) Find the biggest ramp with triple fence h.a.v. symmetric (inside and outside border)

40. Donut.math.toronto.edu/~naoki/prob.html List of unsolved problemsList of unsolved problems. This is a list of lists of unsolved problems in various subjects unsolved problems in mathematics; Unsolved http://donut.math.toronto.edu/~naoki/prob.html

Page 2     21-40 of 103    Back | 1  | 2  | 3  | 4  | 5  | 6  | Next 20