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Topic: Feynman point


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In the News (Mon 6 Oct 08)

  
  Richard Feynman - Wikipedia, the free encyclopedia
Feynman was born in Far Rockaway, Queens, New York; his parents were Jewish and attended synagogue every Friday, although they were unritualistic in their practice of Judaism as a religion.
Feynman gained great pleasure from coming up with such a "freshman level" explanation of the connection between spin and statistics (that groups of particles with spin 1/2 "repel", whereas groups with integer spin "clump"), a question he pondered in his own lectures and which he solved in the 1986 Dirac memorial lecture.
Feynman did not dispute the quark model; for example, when the 5th quark was discovered, Feynman immediately pointed out to his students that the discovery implied the existence of a 6th quark, which was duly discovered in the decade after his death.
en.wikipedia.org /wiki/Feynman   (5334 words)

  
 Feynman point - Wikipedia, the free encyclopedia
The Feynman point comprises the 762nd through 767th decimal places of π, consisting of the digit 9 repeated six times.
Since π is an irrational number with an infinite non-repeating decimal expansion which may well be normal, any given sequence of any length can be expected to be found given enough digits, but it is the appearance of the sequence after relatively few digits which makes the Feynman point a mathematical curiosity.
The name refers to a remark made by the physicist Richard Feynman, expressing a wish to memorise the digits of π as far as that point so that when reciting them, he would be able to end with "...
en.wikipedia.org /wiki/Feynman_point   (185 words)

  
 Feynman’s Ants
Feynman” the physicist Richard Feynman described how he had studied the behavior of ants while he was in graduate school at Princeton and later when he was teaching at Caltech.
Feynman was awarded the Nobel prize in 1965 for his contributions to the theory of quantum electrodynamics.
By using the word “straight” here, Feynman is tacitly acknowledging that each individual ant actually does possess some innate propensity for “straightness”, presumably due to its own physical symmetries, and he is invoking this propensity in order to explain the asymptotic global straightness of their common trails.
www.mathpages.com /home/kmath320/kmath320.htm   (3256 words)

  
 Pi - Wikipedia, the free encyclopedia
The 9 points (-1,-1), (-1,0), (-1,1), (0,-1), (0,0), (0,1), (1,-1), (1,0), (1,1) are found to be inside the circle, so the approximate area is 9, and π is calculated to be approximately 2.25.
Because the coordinates of all points that can be constructed with compass and straightedge are constructible numbers, it is impossible to square the circle: that is, it is impossible to construct, using compass and straightedge alone, a square whose area is equal to the area of a given circle.
Another approximation of π is to throw points randomly into a quarter of a circle with radius 1 that is inscribed in a square of length 1.
en.wikipedia.org /wiki/Pi   (4643 words)

  
 Long Now: Views: Essays
Feynman decided to test this assumption on a problem that he was familiar with in detail: quantum chromodynamics.
Feynman's router equations were in terms of variables representing continuous quantities such as "the average number of 1 bits in a message address." I was much more accustomed to seeing analysis in terms of inductive proof and case analysis than taking the derivative of "the number of 1's" with respect to time.
Feynman was always quick to point out to them that he considered their specific models "kooky," but like the Connection Machine, he considered the subject sufficiently crazy to put some energy into.
www.longnow.org /views/essays/articles/ArtFeynman.php   (4323 words)

  
 DSL Services, T-1 Services for Business: Feynman Group in Eugene Oregon
Feynman Group is strictly a business solutions provider, so our technical staff is always available for your questions during business hours, and we are on-call 24x7x365 for those unforeseen emergency situations.
Feynman Group SDSL is 35 times faster than a 28.8 Kbps dial-up modem and is available in various speeds up to 1.5 Mbps.
Feynman Group Fractional T-1 services are available in increments from 384k, to 768k, to 1.1 Mbps, even up to a full T-1 (1.5 Mbps) with a 50% Committed Information Rate (CIR).
www.feynmangroup.com /services/connectivity.cfm   (490 words)

  
 Time [Internet Encyclopedia of Philosophy]
Einstein's point is that a clock on this rock might measure a different duration than a second clock in a rocket hurtling past the rock.
Feynman diagrams in particle physics were described by Feynman himself as illustrating how a particle's moving forward in time is actually its antiparticle moving backward in time.
Pointing out the relativity of simultaneity in Einstein's theory of relativity, the B-theorist also argues that an event's being present is relative to reference frame, a point that is missed by the A-theorist.
www.iep.utm.edu /t/time.htm   (16740 words)

  
 Hey Feynman - Articles - Physics - Feynman Diagrams   (Site not responding. Last check: 2007-11-01)
The second, an electron goes from point A to point B in space-time, is illustrated by the lines from 1 to 5, 5 to 3, 2 to 6, and 6 to 4.
The third, an electron emits or absorbs a photon, is illustrated by the junctions at points 5 and 6.
The second action fundamental to quantum electrodynamics is: an electron goes from point A to point B in space-time.
www.heyfeynman.com /article_info.php?articles_id=13   (1112 words)

  
 Electromagnetism and Rotational Relativity
Feynman concludes that Maxwell’s equations and the Lorentz force law apply only in inertial frames of reference.
This idea stressed by Feynman … the principle that the laws of electromagnetism do not work in rotating frames of reference … was seemingly challenged in experiments performed recently by Guala-Valverde et al.
It should be noted that, viewed from the rotating frame K’, the polarization in case d’ (magnet and probe mutually at rest) and the lack of polarization in case c’ (magnet and probe rotate together) are difficult to explain.
www.maxwellsociety.net /PhysicsCorner/CurrentLoopPolarization/ElectromagnetismAndRotationalRelativity.html   (727 words)

  
 Feynman Project 1
Feynman’s answer: one needs to choose a unique oscillator solution x3 which gives exactly ½ of sum of advanced (i.e., from the future) and retarded (i.e., from the past) delayed classical actions at a distance between the toy electrons 1 and 2.
Feynman's Space-Time Picture of Non-Relativistic Quantum Mechanics in which the Born probability density is from the combined influence of advanced paths from the future meeting retarded paths from the past at a single event (x,t).
Therefore, from this point of view, there is a deep similarity between orthodox quantum mechanics and Feynman’s idea that an electron does not interact directly with itself, but only interacts with other electrons, or quarks etc., because the electron cannot modify its own pilot wave, only other electrons etc. can do so.
www.qedcorp.com /pcr/pcr/feynman/feynpro1.html   (7820 words)

  
 Feynman Fans Speak Out!
How I Discovered Richard Feynman (and, recently, The Friends of Tuva): Years ago, perhaps in the early eighties, I was listening to CBC Radio in North Vancouver, Canada, and heard a telephone conversation between the radio host and an American in California.
I represented the spirit of Feynman and Tuva at this year's Ig Nobels (www.improb.com/), spent two hours two weeks ago doing oral history with Freeman Dyson (no one warned me he was so *funny*), and generally giggle most of the time.
Feynman expressed great difficulty in believing in a God who can care or deal with such a minute or insignificant creature as he was.
web.ics.purdue.edu /~cirillo/rpffans.htm   (6332 words)

  
 Open Questions: Superstring Theory
Richard Feynman was one of the key contributors to the formulation of a satisfactory theory of quantum electrodynamics.
Point particle grand unified models could be constructed using almost an infinite number of gauge symmetry groups.
Because the same reality underlies both points of view it is possible to work with whichever of the two happens to be easier in a given situation.
www.openquestions.com /oq-ph001.htm   (16737 words)

  
 The Contributions of Dr. Richard P. Feynman   (Site not responding. Last check: 2007-11-01)
Feynman was accepted into M.I.T. for his undergraduate coursework where he continued to excel in physics and science, “I was interested only in science; I was no good at anything else.”[7].
By 1945 Feynman published his dissertation under John Wheeler, which was concerned with the application of quantum mechanics to the classical physics principle of least action.
Now when calculating which point takes the very least amount of time we find it is the point where the angle of incidence equals the angle of reflection (segment G in the diagram).
www.u.arizona.edu /~philipm/research/feynman/index.html   (1274 words)

  
 The Shortest Distance Takes The Longest Time   (Site not responding. Last check: 2007-11-01)
We have been taught that the shortest distance between two points is a "line".
The analog of a line in space is for space-time a motion at uniform velocity in a constant direction.
Feynman's statement implies that a "coasting object" takes the route that takes the longest time.
www.tvbn.com /Science/RichardFeynman.shtml   (1214 words)

  
 [No title]   (Site not responding. Last check: 2007-11-01)
I might add that Feynman had the reputation of mostly ignoring what everyone else was up to in physics, and AFAIK he never attended a gtr conference held during or after the initiation of the Golden Age (circa 1960-1975).
Feynman's purpose was very explicitly to formulate gravity in a way that would allow the application of standard methods of quantization.
Feynman's starting point, I think, was a rejection of what might be called ``gravitational exceptionalism,'' the idea that general relativity was somehow a special theory unlike any other.
math.ucr.edu /home/baez/PUB/dbwf2   (20256 words)

  
 Stardrive.org - - Article -- Feynman on computingy
The state si at the space-time point i is a given function Fi(sj,sk...) of the state at the points j, k in some neighborhood of i...
Feynman also says that the ambiguity in the 4-potential from the internal symmetry gauge transformations (in a given gauge constraint) is not relevant to the physical reality of it anymore than the ambiguity of the Maxwell field tensor under Lorentz space-time transformations.
In fact, it may be The Eccles Gate where mind meets matter and consciousness is generated in the feedback of that electron to its quantum pilot wave that it shares with 10^18 other caged electrons all over the human brain to holographically (Pribram) generate a single conscious moment of about 0.3 seconds.
www.stardrive.org /Feynman.html   (1945 words)

  
 Applet JFeynman   (Site not responding. Last check: 2007-11-01)
Point P lies at the intersection of FG' and o.
Point F'' traces out (as you have shown above) the circle with diameter 100 centered at the point F', which is also situated far left.
The distance of point F from this 'straight line' is not changed.
www.lostlecture.host.sk /JFeynmanEn.htm   (743 words)

  
 [No title]
Barry Merriman posted: >Actually, feynman's hypothesis was that it was an engine failure, >which is why he wrote a detailed chapter in the report on his investigations >of the engines.
Feynman, in his quest to be the wondrous mystical > 'safecracker', did not perform a disservice to the investigation by > neglecting to tell us from whence he was being fed information at the time.
Feynman was as well qualified as anyone to investigate the accident.
www.research.ibm.com /people/s/shearer/useposts/fus93.txt   (12119 words)

  
 Brad Cox, Ph.D.
They point out that these figures are for unmanned rockets but since the Shuttle is a manned vehicle "the probability of mission success is necessarily very close to 1.0." It is not very clear what this phrase means.
The empirical formula was known to be uncertain, for it did not go directly through the very data points by which it was determined.
There were a cloud of points some twice above, and some twice below the fitted curve, so erosions twice predicted were reasonable from that cause alone.
www.virtualschool.edu /mon/SocialConstruction/FeynmanChallengerRpt.html   (5154 words)

  
 Feynman
Richard Feynman, Prix Nobel de Physique 1965, a non seulement développé les connaissances dans sa discipline, mais donné un exemple extraordinaire de ce qu'est vraiment l'attitude scientifique et l'esprit critique.
So I have just one wish for you -- the good luck to be somewhere where you are free to maintain the kind of integrity I have described, and where you do not feel forced by a need to maintain your position in the organization, or financial support, or so on, to lose your integrity.
Feynman lectures on physics / by R.P. Feynman, R.B. Leighton and M. Sands.
pages.globetrotter.net /pcbcr/feynman.html   (3736 words)

  
 The Warrior Class Blog » Global Warming and the Scientific Tradition
Based on recent conversation of global warming, a reader sent me a link to this article which is a much more entertaining but even more precise expression of my points concerning the nature of the science of global warming.
As this article accurately reports, Feynman was one of the people who made it clear to me that science had nothing to do with a concensus.
I referred to training in science only to introduce a rather abstruse point I was about to make regarding the nature of hypotheses, which I have explained many times, but for some reason you can’t stand.
artofwarplus.com /wordpress/?p=836   (3512 words)

  
 Class Diary for PHY 6648 "Quantum Field Theory I"
Derivation of the Feynman propagator for a scalar field.
Feynman rules in momentum space: momentum conservation at each vertex, factors at external points.
An improved version of the Feynman rules for phi-fourth theory.
www.phys.ufl.edu /~matchev/phy6648/diary.html   (362 words)

  
 Feynman's Talk
This transcript of the classic talk that Richard Feynman gave on December 29th 1959 at the annual meeting of the American Physical Society at the California Institute of Technology (Caltech) was first published in the February 1960 issue of Caltech's Engineering and Science, which owns the copyright.
Furthermore, a point that is most important is that it would have an enormous number of technical applications.
Now, you might say, ``Who should do this and why should they do it?'' Well, I pointed out a few of the economic applications, but I know that the reason that you would do it might be just for fun.
www.zyvex.com /nanotech/feynman.html   (6158 words)

  
 Pi Article, Pi Information   (Site not responding. Last check: 2007-11-01)
This result establishes the impossibility of squaring thecircle : it is impossible to construct, using ruler and compass alone, a square whose area is equal to the area of a given circle.
Thereason is that the coordinates of all points that can be constructed with ruler and compass are special algebraic numbers.
Euler pointed out the possibility that π might be transcendental
www.anoca.org /dps/number/pi.html   (1889 words)

  
 Inwit Publishing, Inc. and Inwit, LLC -- Writings, Links and Software Demonstrations - History and Oddities of the ...
Notice the run of six 9’s at place 762; that’s called the Feynman point, and is a little unexpected.
The first data point is Dase; he took about 7 hrs/digit.
Shanks’ algorithm was no worse than Dase’s, but Dase had the advantage of being the greatest mental calculator who ever lived.
www.inwit.com /inwit/writings/historyandodditiesofpi.html   (5713 words)

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