41. Unsolved Problems In Physics unsolved problems in physics. Why are we here? See also unsolved problems in mathematics; unsolved problems in chemistry; unsolved problems in biology. http://www.fact-index.com/u/un/unsolved_problems_in_physics.html

Main Page See live article Alphabetical index Unsolved problems in physics The following 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? 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?

42. Unsolved Problems: References unsolved problems. General References. The following books contain unsolved problems or are referenced by the unsolved problem of the week. http://cage.rug.ac.be/~hvernaev/problems/references.html

Unsolved Problems General References The following books contain unsolved problems or are referenced by the unsolved problem of the week Especially rich are [Croft 1991] [Guy 1994] and [Klee 1991] [Beiler 1966] Albert H. Beiler, Recreations in the Theory of Numbers: The Queen of Mathematics Entertain. 2nd edition. Dover. New York: 1966. [Bondy 1976] J. A. Bondy and U. S. R. Murty, Graph Theory with Applications. North Holland. New York: 1976. [Boroczky 1987] Intuitive Geometry. North-Holland Publishing Company. New York: 1987. [Croft 1991] Hallard T. Croft, Kenneth J. Falconer, and Richard K. Guy, Unsolved Problems in Geometry. Springer-Verlag. New York: 1991. [Dudeney 1970] H. E. Dudeney, Amusements in Mathematics. Dover. New York: 1970. [Dunham 1990] William Dunham, Journey Through Genius: The Great Theorems of Mathematics. John Wiley and Sons. New York: 1990. [Erdos 1980] Old and New Problems and Results in Combinatorial Number Theory. [Gardner 1978] Martin Gardner, Mathematical Magic Show. Vintage Books. New York: 1978. [Gardner 1983] Martin Gardner

43. List Of Unsolved Problems - Encyclopedia Article About List Of Unsolved Problems encyclopedia article about List of unsolved problems. List of unsolved problems in Free online English dictionary, thesaurus and encyclopedia. http://encyclopedia.thefreedictionary.com/List of unsolved problems

Dictionaries: General Computing Medical Legal Encyclopedia List of unsolved problems Word: Word Starts with Ends with Definition This is a list of lists of unsolved problems in various subjects: Unsolved problems in mathematics This article describes currently unsolved problems in mathematics The seven Millennium Prize Problems set by the Clay Mathematics Institute are: 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 Other still-unsolved problems: Number of Magic squares Goldbach's conjecture Twin prime conjecture Hilbert's sixteenth problem Click the link for more information. Unsolved problems in physics 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. Click the link for more information.

44. Unsolved Problems In Physics - Encyclopedia Article About Unsolved Problems In P encyclopedia article about unsolved problems in physics. unsolved problems in physics in Free online English dictionary, thesaurus and encyclopedia. http://encyclopedia.thefreedictionary.com/unsolved problems in physics

Dictionaries: General Computing Medical Legal Encyclopedia Unsolved problems in physics Word: Word Starts with Ends with Definition The following are some of the unsolved problems This is a list of lists of unsolved problems in various subjects: Unsolved problems in mathematics Unsolved problems in physics Unsolved problems in chemistry Unsolved problems in biology Unsolved problems in economics Unsolved problems in governance Unsolved problems in cognitive science Unsolved problems in neuroscience Unsolved problems in computer science Unsolved problems in software engineering Click the link for more information. in physics Physics physikos natural physis ): Nature) is the science of Nature in the broadest sense. Physicists study the behaviour and interactions of matter and radiation. The laws of physics are generally expressed as mathematical relations. Physics is very closely related to the other natural sciences, particularly chemistry, the science of molecules and the chemical compounds that they form in bulk. Chemistry draws on many fields of physics, particularly quantum mechanics, thermodynamics and electromagnetism. However, chemical phenomena are sufficiently varied and complex that chemistry is usually regarded as a separate discipline. Click the link for more information.

45. Mathematical Problems Distances; register swap or the diameter of GL(n,F2); Combinatorial Games - unsolved problems (by RK Guy). Enumerations. Autocorrelation http://www.mathematik.uni-bielefeld.de/~sillke/problems.html

Mathematical Problems Graph Theory Stable sets - The number of stable/independent sets of a graph Planar Graphs - Special embeddings of planar graphs Graph Parameter - The Rank and the Chromatic Number Cograph (P4 free Graphs) - Graphs with maximal rank Nordhaus type question - eigenvalues Number Theory Lucas-Lehmer series - Factors and Period length Partial anwers: K Brown 1 K Brown 3 Chapman Some Properties of the Lucas Sequence (2,4,14,52,194,...) of Kevin Brown Reputnics - when are they squares? (Chris Thompson) x^3 + y^3 + z^3 - Representations by sum of Cubes (Noam Elkies) FLT++ - x^r + y^s = z^t Combinatorics Hadamard Matrices - Maximizing Determinants - M. Hudelson, V. Klee, D. Larman; Largest j-Simplices in d-Cubes: Some Relatives of the Hadamard Maximum Determinant Problem (1996) GKL - P. Gritzmann, V. Klee, D. Larman; Largest j-Simplices in n-Polytopes (unpublished) A Library of Hadamard Matrices - N. J. A. Sloane Grid-avoidance problems - A collection of problems Gray Codes - Gray Codes with few Tracks Distance Sets - Sets with equal Distances register swap - or the diameter of GL(n,F2)

46. Early New York - Unsolved Problems Of Life unsolved problems Of Life. unsolved problems OF LIFETHE OLD POST-ROAD AND ITS HELL GATE BRANCHES-HOMES OF MERCHANT PRINCES-MANHATTANS BIGGEST TREE. http://www.oldandsold.com/articles11/new-york-history-9.shtml

Please Select Search Type: (select category) Antiques Digest Auctions Auction Number Baby Books Classical DVD Outdoor Living Popular Music Toys Username Browse Auctions Appraisal Antiques Digest Bookstore ... Home Early New York History: Home On The East River A Garden Calendar Panorama Of East River Islands The Story Of Ward's Island ... More Articles About New York City Unsolved Problems Of Life ( Originally Published 1893 ) UNSOLVED PROBLEMS OF LIFE-THE OLD POST-ROAD AND ITS HELL GATE BRANCHES-HOMES OF MERCHANT PRINCES-MANHATTANS BIGGEST TREE THE old colonel advises me to buy a tub and sun myself in it during these early days of autumn. He found me this morning a perplexed philosopher. I had been troubled by the unsolved problems of life. My opposite neighbor, name and nativity unknown, who lives in a shabby little frame-house, always runs to his door when he hears the sturdy step of Bob, the postman, turn the corner, and hails him as he passes with an inquiry for letters. Nobody thinks of writing to him. He has had but one letter this year, and yet he would as soon think of omitting his breakfast as of letting this ceremonial of inquiry pass. Why he does it is a problem which puzzles me. I put it to the postman, and he figured upon it thoughtfully for a moment and then gave it up; but he also gave it to me as a bit of his experience that the people on his route who seldom received a letter were always the most anxious to learn whether the mail had brought anything for them. It was of my grandmother—the picture in my library of a dainty maiden in clinging robes and baby waist, and with great sunny curls heaped high above her unwrinkled forehead, is her portrait painted in the day of her belleship—in the later years of her life, when her cap was her care and her knitting was her comfort. " Felix," she said, one day, as she stopped knitting to smooth down the long lace lappets of her cap," I have been thinking while you were at school how little we learn here in threescore years, and yet when we are children we expect to learn everything by the time we are grown up. But we'll know it all by-and-by, that's one comfort, and for a little while it doesn't signify."

47. A List Of Unsolved Problems In Physics For The 21st Century Date PrevDate NextThread PrevThread NextDate IndexThread Index A List of unsolved problems in Physics for the 21st Century. http://www.lns.cornell.edu/spr/2000-08/msg0027202.html

Date Prev Date Next Thread Prev Thread Next ... Thread Index A List of Unsolved Problems in Physics for the 21st Century Subject : A List of Unsolved Problems in Physics for the 21st Century From : alfred_einstead@my-deja.com Date : 08 Aug 2000 00:00:00 GMT Approved : baez@math.ucr.edu Newsgroups : sci.physics.research Organization : Deja.com Follow-Ups Re: A List of Unsolved Problems in Physics for the 21st Century From: dgoncz@aol.commypants (From way up in a tree Doug Goncz) Re: A List of Unsolved Problems in Physics for the 21st Century From: Prev by Date: Re: Superfluid He properties Next by Date: Re: Expansion of the Universe and Ionization Prev by thread: JOB: Job offer PhD-student Next by thread: Re: A List of Unsolved Problems in Physics for the 21st Century Index(es): Date Thread

48. Re: Unsolved Problems In QED IndexThread Index Re unsolved problems in QED. To sciphysics-research@moderators.isc.org; Subject Re unsolved problems in QED; http://www.lns.cornell.edu/spr/2003-04/msg0049968.html

Date Prev Date Next Thread Prev Thread Next ... Thread Index Re: unsolved problems in QED To : sci-physics-research@moderators.isc.org Subject : Re: unsolved problems in QED From Date : 1 Apr 2003 07:24:13 GMT Approved : baez@math.removethis.ucr.andthis.edu (s.p.research moderator) Message-ID b6beqt$107$1@panther.uwo.ca Newsgroups : sci.physics.research Organization : clef digital systems ltd References User-Agent Follow-Ups Re: unsolved problems in QED From: Re: unsolved problems in QED From: baez@galaxy.ucr.edu (John Baez) Prev by Date: Re: A programming language for quantum computers? Next by Date: Re: Ugly theories are good, says Anthropic Susskind! Prev by thread: Re: unsolved problems in QED Next by thread: Re: unsolved problems in QED Index(es): Date Thread

49. LookSmart - Directory - Unsolved Problems Problems. unsolved problems Take a look at different conjectures from historical mathematicians, and join the search for answers. http://search.looksmart.com/p/browse/us1/us317914/us328800/us1164188/us10022111/

@import url(/css/us/style.css); @import url(/css/us/searchResult1.css); Home IN the directory this category YOU ARE HERE Home Sciences Mathematics Number Theory Unsolved Problems - Take a look at different conjectures from historical mathematicians, and join the search for answers. Directory Listings About Beal, Andrew - The Beal Conjecture and Prize Find the conjecture devised by Andrew Beal in the process of seeking Fermat's proof, and see the rules for winning the prize associated with it. Christian Goldbach Find a biography of this professor of mathematics, the story behind the Goldbach Conjecture, and a host of recommended resources. Diophantine m-tuples Browse historical and recent results on sets with the property that the product of any two elements is one less than a square. Goldbach Conjecture Research Read an analysis of several different methods of proving Goldbach's conjecture. Includes several tables and graphs illustrating examples proved computationally. Goldbach Conjecture Verification Author for this resource provides computational results, graphs, and visual examples. Check out different recommended resources. Goldbach's Conjecture - The Prime Glossary Locate a short biography on Goldbach, a description of his mathematical hypothesis, and various recommended resources.

50. Crime: The Unsolved Problem Crime The Unsolved Problem. Still, both crime and cancer are unsolved problems and nobody has answers that promise wholesale improvements in crime statistics. http://www.libertyhaven.com/politicsandcurrentevents/crimeandterrorism/crimeunso

Theoretical/Philosophical Issues Politics/Government Personal Freedom Issues Regulations ... Yourname@libertyhaven.com Email login: Password: Search for: Books Magazines Music Maps Out of Print Books British Books British Magazines British Music Keywords: Crime: The Unsolved Problem Melvin D. Barger What causes crime? Why do some individuals possess tendencies which lead them to commit acts of violence and predation: robberies, assaults, rape, and other felonies? What sets the habitual or occasional criminal apart from the mainstream of society? More important, what can be done to "change" criminals into productive, law-abiding citizens? The theory that has partly governed public policy for many years is that crime is caused by an unjust society. A most eloquent spokesman for this point of view was Ramsey Clark, who served as assistant attorney general in the Kennedy Administration and attorney general in the Johnson Administration. Here's how Clark described the crime problem in his well-known 1970 book, Crime in America: If we are to deal meaningfully with crime, what must be seen is the dehumanizing effect on the individual of slums, racism, ignorance and violence, of corruption and impotence to fulfill rights, of poverty and unemployment and idleness, of generations of malnutrition, of congenital brain damage and prenatal neglect, of sickness and disease, of pollution, of decrepit, dirty, ugly, unsafe, overcrowded housing, of alcoholism and narcotics addiction, of avarice, anxiety, fear, hatred, hopelessness and injustice. These are the fountainheads of crime. They can be controlled. As imprecise, distorted and prejudiced as our learning is, these sources of crime and their controllability clearly emerge to any who would see.

51. Unsolved Problems In Playing-Card Research unsolved problems in PlayingCard Research. Submissions by Sir Michael Dummett, February 10th, 1999. unsolved problems concerning Tarot and Italian Cards. http://i-p-c-s.org/problist.html

[Note: This page is written in the Unicode character set, and employs characters which may not be properly displayed without an adequate Unicode font. A downgrade to an ISO Latin 1 version of this document may be viewed, with some loss of precision.] Unsolved Problems in Playing-Card Research Submissions by Sir Michael Dummett, February 10th, 1999 Unsolved Problems concerning Tarot and Italian Cards Can definite evidence be found to assign the standard pattern exemplified by early Trappola cards from north of the Alps to Venice, or perhaps to Trent or some other city? Two questions relate to Piedmont. The first is this: Various features of Tarot games played in Piedmont indicate a connection with Bologna: Papi the superiority of the Angel to the World. Can any early connection be found between Bologna and Piedmont, or Tarot players in both places, be discovered to account for this? Can any pre-XVIIIth-century tarocchi What were the origins of the pattern (for regular cards) we know as Venetian, and when did it originate? Papi Is it possible to discover any Sicilian Minchiate cards (known there as Gallerini ), which would have been manufactured up to about 1770? The game differed from Florentine

52. Unsolved Problems In Playing-Card Research Submissions by Sir Michael Dummett, February 10th, 1999. unsolved problems concerning Tarot and Italian Cards. unsolved problems about Early European Cards. http://i-p-c-s.org/problis1.html

Home Join IPCS Publications Calendar ... Links Unsolved Problems in Playing-Card Research Background In the January/February 1999 issue of The Playing-Card (Vol XXVII No 4), IPCS president Robert Kissel invited members to contribute to a list of unsolved problems in playing-card research. This would be the playing-card equivalent of the famous list of unsolved mathematical problems published by David Hilbert 100 years ago. Submissions by Sir Michael Dummett, February 10th, 1999 Unsolved Problems concerning Tarot and Italian Cards Can the type of cards, both regular and Tarots (not standardised nearly enough to form a standard pattern), called by Sylvia Mann 'archaic' be definitely assigned to Ferrara, as conjectured by Dummett, to Venice, as supposed by almost everyone else, or to any other city? Can definite evidence be found to assign the standard pattern exemplified by early Trappola cards from north of the Alps to Venice, or perhaps to Trent or some other city? Two questions relate to Piedmont. The first is this: Various features of Tarot games played in Piedmont indicate a connection with Bolgna: the treatment of the four ' Papi 'Empress, Popess, Emperor and Popeas of equal rank, any one of them played later to a trick beating one played earlier;

53. Entrez PubMed unsolved problems in diastole. Courtois M, Ludbrook PA, Kovacs SJ. Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1

54. Unsolved Problems next up previous contents Next Does there exist a Up Famous Problems in Mathematics Previous Which are the. unsolved problems. http://db.uwaterloo.ca/~alopez-o/math-faq/node59.html

Next: Does there exist a Up: Famous Problems in Mathematics Previous: Which are the Unsolved Problems Does there exist a number that is perfect and odd? Collatz Problem Goldbach's conjecture Twin primes conjecture Alex Lopez-Ortiz Mon Feb 23 16:26:48 EST 1998

55. Unsolved Problems unsolved problems. Does there exist a number that is perfect and odd? References. unsolved problems in Number Theory. Richard K Guy. Springer, Problem E16. http://db.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.

56. Unsolved Problems On Mathematics For The 21st Century unsolved problems on Mathematics for the 21st Century. A Tribute to Kiyoshi Iséki’s 80th Birthday Edited by JM Abe and S. Tanaka http://www.iospress.nl/html/boek631797093.html

Unsolved Problems on Mathematics for the 21st Century Edited by: J.M. Abe and S. Tanaka 2001, 332 pp., hardcover ISBN: Price: IOS Press Nieuwe Hemweg 6B, 1013 BG Amsterdam, The Netherlands +31 20 688 3355 phone, +31 20 620 3419 fax info@iospress.nl e-mail

57. ScienceProfessionals Forum - Greatest Unsolved Problems In Science ScienceProfessionals Forum « Greatest unsolved problems In Science ». unsolved problems in Science. Post your favorite discuss the details. http://www.scienceprofessionals.com/cgi-bin/yabb/YaBB.pl?board=unsolved

58. Sensei's Library: Unsolved Problems Sensei s Library, page unsolved problems, rating n/a. SL is a WikiWikiWeb about the game of Go (Paduk, Baduk, Weichi, Weiqi). unsolved problems http://senseis.xmp.net/?UnsolvedProblems

59. Online Encyclopedia - Unsolved Problems In Physics , Encyclopedia Entry for unsolved problems in physics. The following is an incomplete list of outstanding problems in physics.......Encyclopedia http://www.yourencyclopedia.net/Unsolved_problems_in_physics.html

Encyclopedia Entry for Unsolved problems in physics Dictionary Definition of Unsolved problems in physics The following 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? 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?

60. Know-how Wiki: Unsolved Problems KnowHow Wiki (home) Recent Changes Preferences Topics unsolved problems Solved Problems This is a list of links to problems http://www2.iro.umontreal.ca/~paquetse/cgi-bin/wiki.cgi?Unsolved_Problems

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