61. Wilmott Forums - What Are The Most Important Unsolved Problems In Topic Title What are the most important unsolved problems in finance today? Created On Sun Jan 11, 04 1239 PM, All problems in finance are unsolved! http://www.wilmott.com/messageview.cfm?catid=19&threadid=12884

62. List Of Unsolved Problems :: Online Encyclopedia :: Information Genius List of unsolved problems. Online Encyclopedia This is a list of lists of unsolved problems in various subjects unsolved problems http://www.informationgenius.com/encyclopedia/l/li/list_of_unsolved_problems.htm

Quantum Physics Pampered Chef Paintball Guns Cell Phone Reviews ... Science Articles List of unsolved problems Online Encyclopedia 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 cognitive science Unsolved problems in neuroscience Unsolved problems in computer science Unsolved problems in software engineering This content from wikipedia is licensed under the GNU Free Documentation License Power Supplies Hardware Information Law Advice

63. Perplexus.info :: Search perplexus dot info, Home Search. Search results for unsolved problems Chess anyone? (in Games) Posted on 200405-13 by SilverKnight http://perplexus.info/search.php?presch=1

64. Unsolved Problems Deficient Stars unsolved problems. Since the discovery of RCrB itself, the mechanism that produces fadings has been elusive. Primary http://star.arm.ac.uk/~csj/rcrb_rev/node15.html

Next: Bibliography Up: R Coronae Borealis Stars Previous: Other Hydrogen-Deficient Stars Unsolved Problems Since the discovery of RCrB itself, the mechanism that produces fadings has been elusive. Primary data connecting pulsation phase and the trigger for fadings exists for only two RCBs (V854Cen and RYSgr), and protracted photometry of several RCBs will be necessary to establish any connection firmly. A second difficulty is encountered by the physical conditions necessary for dust to condense above the surface of the star. The frequency and duration of fading events implies a geometry in which the dust clouds form within two stellar radii (2 R ). Under normal conditions, the local temperature would be too high for dust to condense at this distance, and a condensation distance of 20 R would be expected. Recent models treat the chemistry, energy balance and dust nucleation in pulsating star atmospheres in considerable detail. They show that excess cooling can occur during adiabatic expansion after the passage of a shock wave, reducing the local temperature to about 1500K within 1.5-3 R . It remains to be shown that pulsations in all RCB stars provide the necessary conditions for dust nucleation to occur at this distance. The RCB carbon abundance remains an enigma. If it is

65. UNSOLVED PROBLEMS again stars unsolved problems. Since the discovery of RCrB itself, the mechanism that produces fadings has been elusive. Primary http://star.arm.ac.uk/~csj/research/rcb_review/node20.html

Next: Conclusion Up: R CORONAE BOREALIS STARS Previous: Born-again stars UNSOLVED PROBLEMS Since the discovery of RCrB itself, the mechanism that produces fadings has been elusive. Primary data connecting pulsation phase and the trigger for fadings exists for only two RCBs (V854Cen and RYSgr, [ Lawson et al. 1992 Pugach 1977 ]), and protracted photometry of several RCBs will be necessary to establish any connection firmly. A second difficulty is encountered by the physical conditions necessary for dust to condense above the surface of the star. The frequency and duration of fading events implies a geometry in which the dust clouds form within two stellar radii (2 R Clayton et al. 1992 ]). Under normal conditions, the local temperature would be too high for dust to condense at this distance, and a condensation distance of 20 R would be expected ([ Fadeyev 1986 ]). Recent models treat the chemistry, energy balance and dust nucleation in pulsating star atmospheres in considerable detail ([ Woitke et al. 1996a ], 1996b). They show that excess cooling can occur during adiabatic expansion after the passage of a shock wave, reducing the local temperature to about 1500K within 1.5-3 R . It remains to be shown that pulsations in all RCB stars provide the necessary conditions for dust nucleation to occur at this distance. The RCB carbon abundance remains an enigma ([ Asplund et al. 2000

66. Erdos On Graphs: His Legacy Of Unsolved Problems, By Fan Chung And Ron Graham Erdos on Graphs His Legacy of unsolved problems. Fan Chung and Ron Graham. This book is a tribute to Paul Erdos, the wandering mathematician http://webbooks.net/books/_peters/Chung.html

Erdos on Graphs: His Legacy of Unsolved Problems Fan Chung and Ron Graham A. K. Peters, Ltd., 1998 ISBN 1-56881-079-2 160 pages List price: $30.00 WebBooks Price: $27.00 Handling/shipping: Surface shipping included; express/overnight at cost. Jump to WebBooks Home Page

67. 8.2 Known But Unsolved Problems And Bugs and warning Contents Index 8.2 Known but unsolved problems and bugs. The following are known problems of the orderN methods used http://www.uam.es/departamentos/ciencias/fismateriac/siesta/manual-1.3/node46.ht

Next: 9 PROJECTED CHANGES AND Up: 8 PROBLEM HANDLING Previous: 8.1 Error and warning Contents Index 8.2 Known but unsolved problems and bugs The following are known problems of the order- N methods used: The convergence of the conjugate-gradient minimization of the electronic energy in the first selfconsistency step (with SolutionMethod orderN ) may be extremely slow (up to 2000 CG iterations, compared to 20 in further selfconsistency steps). Adjusting the ON.eta parameter, so that the total charge is conserved, may be notably difficult for small-gap systems.

68. 7.3 Known But Unsolved Problems And Bugs known problems Contents Index 7.3 Known but unsolved problems and bugs. The following are known problems of the orderN methods used http://www.uam.es/departamentos/ciencias/fismateriac/siesta/manual-0.15/node37.h

Next: 8 PROJECTED CHANGES AND Up: 7 PROBLEM HANDLING Previous: 7.2 Other known problems Contents Index 7.3 Known but unsolved problems and bugs The following are known problems of the order- N methods used: The convergence of the conjugate-gradient minimization of the electronic energy in the first selfconsistency step (with SolutionMethod orderN ) may be extremely slow (up to 2000 CG iterations, compared to 20 in further selfconsistency steps). Adjusting the ON.eta parameter, so that the total charge is conserved, may be notably difficult for small-gap systems.

69. Unsolved Problems In Common Waveform Analysis of Probability and Its Applications. unsolved problems in Common Waveform Analysis. Yuchuan Wei Department of Electrical Engineering http://www.siam.org/journals/problems/01-002.htm

Search Unsolved Problems in Common Waveform Analysis Yuchuan Wei Department of Electrical Engineering Box 202 Beijing University of Aeronautics and Astronautics Beijing 100083, China E-mail: yuchuanwei@21cn.com Summary . Basic questions, analogous to those of classical Fourier analysis, are raised concerning nontrigonometric systems. The answers to these questions are of importance in electrical engineering. Classification. Primary, classical analysis; Secondary, sequences and series Download Options DVI File PostScript File PDF File Questions/Comments about our Web pages? Use our suggestion box or send e-mail to the Online Services Manager. About SIAM Membership Journals SIAM News ... Laura B. Helfrich , Online Services Manager Updated: DJC

70. Known But Unsolved Problems And Bugs Previous Other known problems Known but unsolved problems and bugs. The following are known problems of the orderN methods used http://dipc.ehu.es/arubio/siesta/node37.html

Next: PROJECTED CHANGES AND ADDITIONS Up: PROBLEM HANDLING Previous: Other known problems Known but unsolved problems and bugs The following are known problems of the order- N methods used: The convergence of the conjugate-gradient minimization of the electronic energy in the first selfconsistency step (with SolutionMethod orderN ) may be extremely slow (up to 2000 CG iterations, compared to 20 in further selfconsistency steps). Adjusting the ON.eta parameter, so that the total charge is conserved, may be notably difficult for small-gap systems. Angel Rubio Secades

71. Stephen Wolfram: A New Kind Of Science | Online Notes for The Principle of Computational Equivalence Implications for Mathematics and Its Foundations. unsolved problems in number theory. http://www.wolframscience.com/nksonline/page-1166c-text

Cookies Required A New Kind of Science See http://www.wolframscience.com/nksonlineFAQs.html for more information or send email to support@wolframscience.com Search site Get the NKSwire newsletter Sign the Guestbook

72. Some Unsolved Problems In Coding Theory Index Some unsolved problems in coding theory. To begin, a ``code in this section is any subset of , where is a finite field. More http://web.usna.navy.mil/~wdj/book/node138.html

Next: Coding theory exercises using Up: Error-correcting codes Previous: Quadratic residue codes Contents Index Some unsolved problems in coding theory To begin, a ``code'' in this section is any subset of , where is a finite field. More precisely, a code is a map , where represents the original message space and the space of transmitted messages. Question : Given and , what is the largest for which there is a code of size and minimum distance ? At the moment, this is only known for or if and is relatively small (depending on ). To make the problem easier, let use restrict to the subclass of linear codes. In the case of linear codes, the question can be worded more precisely. Question : Given and , what is the largest for which there is a linear code of length , dimension , and minimum distance ? Again, this isn't known, except in special cases. Back to general codes. Question : Given and , what is the smallest for which there is a code of size and minimum distance ? This related problem is not known either (except for some very special cases, as above). Again, to make the problem easier, let use restrict to the subclass of linear codes. In the case of linear codes, the question can be worded more precisely. Question : Given and , what is the smallest for which there is a code of length , dimension , and minimum distance ? Again, in general this isn't known. In another attempt to make these problems easier, we could ask for something less accurate but still useful. For example, in the last question, instead of fixing

73. Old And New Unsolved Problems Old and New unsolved problems Problems in Plane Geometry and Number Theory. Victor Klee and Stan Wagon. Series Dolciani Mathematical Expositions http://www.maa.org/pubs/books/dol11.html

Old and New Unsolved Problems Problems in Plane Geometry and Number Theory Victor Klee and Stan Wagon Series: Dolciani Mathematical Expositions The book will serve well as a point of entry for students who want to know more about a celebrated question, or simply take in the vistas. Choice This is a book that not only belongs in every university, college, and high school library, it very definitely belongs in every public library. Mathematical Reviews. The book is well-written and readable. Each part of each section concludes with a nice selection of exercises. The authors have appended a useful bibliography to each chapter. It is compulsive reading and will fill your mind with problems that will come back to haunt you again and again during idle moments. The Mathematical Intelligencer Victor Klee and Stan Wagon discuss some of the unsolved problems in number theory and geometry, many of which can be understood by readers with a very modest mathematical background. The presentation is organized around 24 central problems, many of which are accompanied by other, related problems. The authors place each problem in its historical and mathematical context, and the discussion is at the level of undergraduate mathematics. Each problem section is presented in two parts. The first gives an elementary overview discussing the history and both the solved and unsolved variants of the problem. Part Two contains more details, including a few proofs of related results, a wider and deeper survey of what is known about the problem and its relatives, and a large collection of references. Both parts contain exercises, with solutions.

74. AFP: Solved And Unsolved Problems [MJM 1996 2: 127-134] AlphaFetoprotein (AFP) Solved and unsolved problems. http://www.medicine.mcgill.ca/mjm/issues/v02n02/afp.html

Alpha-Fetoprotein (AFP): Solved and Unsolved Problems G.I. Abelev , Ph.D ., and N.L. Lazarevich HISTORICAL OVERVIEW The protein that would later be called alpha-fetoprotein (AFP) was first identified in human fetal sera by Bergstrand and Czar in 1956 on paper electrophoregrams (1). Several confirmations of this finding were made, but the potential role of the protein remained entirely unknown. In 1960, the present authors found an antigen in mouse hepatoma cells that was absent from the liver, blood, and other tissues of normal adult mice. However, the relationship of this antigen to a feto-specific serum protein was only established, unexpectedly, during the course of other study on antigenic maturation of mouse liver in ontogenesis. The next few years brought very broad confirmation and extension of the first clinical observations, with early demonstration of the value of the AFP test in monitoring surgery and chemotherapy, primarily in GCT (8). Very active parallel investigations were carried out on rat and human AFP by Uriel et al. in France. Several highly sensitive methods for AFP detection were elaborated in the early 1970's (9), but the most practical, both in experimental systems and in clinics, was found to be radioimmunoassay (RIA), first introduced by Ruoslahti and Seppala. This assay permitted the detection of AFP from its background level to its maximal values in different pathologies (10). Later, RIA was supplanted by enzyme-linked immunoenzyme assay (ELISA), which is identical to RIA in specificity and sensitivity but more stable and ecologically acceptable. AFP ELISA kits produced by a number of companies are routinely used at present in clinical work throughout the world.

75. William Meeks At MSRI - A Survey Of Unsolved Problems In Minimal Surface Theory William Meeks A Survey of unsolved problems in Minimal Surface Theory and Approaches for Solving Them. MSRI Streaming Video Series http://www.msri.org/publications/ln/msri/2001/minimal/meeks/3/

MSRI Streaming Video Series William Meeks - A Survey of Unsolved Problems in Minimal Surface Theory and Approaches for Solving Them

76. Unsolved Problems In Plasticity unsolved problems in Plasticity. 7/14/01. Click here to start. Table of Contents. unsolved problems in Plasticity. Origins of Irreversibility. http://research.yale.edu/boulder/Boulder-2001/Lectures/sethna/boulder2001b.sethn

Unsolved problems in Plasticity Click here to start Table of Contents Unsolved problems in Plasticity Origins of Irreversibility Crackling Noise in Plasticity Singularity formation? ... Predicted Scaling Curve

77. Unsolved Problems In Physics - Wikipedia, The Free Encyclopedia PhatNav s Encyclopedia A Wikipedia . unsolved problems in physics. In 2003, the state of physics is similar to that in 1905. A http://www.phatnav.com/wiki/wiki.phtml?title=Unsolved_problems_in_physics

78. List Of Unsolved Problems - Wikipedia, The Free Encyclopedia List of unsolved problems. This is a list of articles about unsolved problems in various subjects unsolved problems in biology; unsolved problems in economics. http://www.phatnav.com/wiki/wiki.phtml?title=List_of_unsolved_problems

79. Unsolved Problems In Astrophysics unsolved problems in Astrophysics. List price $39.50 Our price $32.78 (You save $6.72). Book unsolved problems in Astrophysics Customer Reviews http://www.sciencesbookreview.com/Unsolved_Problems_in_Astrophysics_0691016062.h

Unsolved Problems in Astrophysics Unsolved Problems in Astrophysics by Authors: John N. Bahcall , Jeremiah P. Ostriker Released: 17 January, 1997 ISBN: 0691016062 Paperback Sales Rank: List price: Our price: You save: Book > Unsolved Problems in Astrophysics > Customer Reviews: Average Customer Rating: Unsolved Problems in Astrophysics > Customer Review #1: Good book on a wealth of topics This book provides a great amount of information on a wide variety of hot topics in contemporary astronomy, such as cosmology, AGNs, GRBs, and dark matter. My only complaint is that the material does tend to slant towards extragalactic astronomy. However, otherwise the material is extremely useful for someone looking for fresh material to work on. The references also provided within are great. The reading level is also easy, and is probably similar to Scientific American or Sky and Telescope. Unsolved Problems in Astrophysics > Customer Review #2: the information contained therein is accurate and readable!

80. Flooble :: Perplexus :: Search valid on the new site). Home Search. Search results for unsolved problems Would you like to play a game? (in General) Posted on http://flooble.com/perplexus/search.php?presch=1

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