Richard Feynman cytaty (214 cytatów, strona 3)

I wanted most to give you some appreciation of the wonderful world and the physicist’s way of looking at it, which, I believe, is a major part of the true culture of modern times. (ang.)
Źródło: Richard Feynman, Robert Leighton i Matthew Sands, Feynmana wykłady z fizyki, t. III, Mechanika kwantowa, wyd. 2 popr., Państwowe Wydawnictwo Naukowe, Warszawa 1974, s. 435.

Feynmana wykłady z fizyki. Tom 3 Mechanika Kwantowa http://www.feynmanlectures.caltech.edu/III_22.html, 1968

Cytaty o pięknie

„W rzeczywistości wszystko po pewnym czasie się zatrzymuje.”

Richard Feynman

O rzeczywostości , O czasie

„Całą mechanikę kwantową da się wyprowadzić z doświadczenia z dwiema szczelinami.”

Richard Feynman

„Zjawisko, które rozważamy, musi wykazywać pewną trwałość lub stałość. Znaczy to, że jeśli zjawisko jest trudne do zbadania, to obserwowane w różnych sytuacjach powinno wykazywać w mniejszym lub większym stopniu takie same cechy.”

Richard Feynman

Źródło: kwiecień 1963

„Uprzedzenia sprawiają, że trudniej jest coś udowodnić, ale jeśli to coś istnieje, może mimo wszystko liczyć na odkrycie.”

Richard Feynman

Źródło: kwiecień 1963

„Nie mając zbyt szerokich kontaktów z innymi ojcami, nie zdawałem sobie sprawy z tego, jaki jest nadzwyczajny. Jak nauczył się głębokich podstaw nauki, jej umiłowania, chęci poznania tego, co się za nią kryje i dlaczego warto się w nią bawić? Tak naprawdę, nigdy go o to nie pytałem, bo zawsze zakładałem, że są to rzeczy, które ojcowie po prostu wiedzą.”

Richard Feynman książka A co ciebie obchodzi, co myślą inni?

o swoim ojcu.
A co ciebie obchodzi, co myślą inni?
Źródło: Narodziny naukowca

O narodzinach , O nauce

„Cóż to za dziwny gatunek, ci poeci, jeśli potrafią głosić chwałę Jowisza jako żywej istoty, a zachowują milczenie wobec Jowisza – ogromnej kuli złożonej z metanu i amoniaku.”

Richard Feynman

„Mechanika kwantowa opisuje przyrodę jako absurdalną z punktu widzenia zdrowego rozsądku. I w pełni zgadza się z doświadczeniem. Mam więc nadzieję, że zaakceptujecie naturę taką, jaka jest – absurdalną.”

Richard Feynman

O naturze

„Jeśli coś jest rzeczywiście prawdą, powtarzanie obserwacji i poprawianie ich efektywności zwiększa wyrazistość wyników, a nie zmniejsza ją.”

Richard Feynman

Źródło: kwiecień 1963

„Żaden rząd nie ma prawa decydować, co do prawdziwości naukowych zasad, ani w żaden sposób określać charakteru pytań, na które szuka się odpowiedzi. Nie może rząd też oceniać wartości estetycznej artystycznych kreacji, ani ograniczać form literackiej i artystycznej ekspresji. Nie powinien też ogłaszać słuszności doktryn ekonomicznych, historycznych, religijnych czy filozoficznych. Za to, ma w stosunku do swych obywateli obowiązek zapewniania wolności, aby pozwalała tym obywatelom udzielać się w dalszych przygodach i rozwoju rasy ludzkiej.”

Richard Feynman

O charakterze , O wolności , Pytanie

„Sądzę, że ma to pewne znaczenie w omawianej przez nas kwestii.”

Richard Feynman

I believe that has some significance for our problem.
Wygłoszone kąśliwym tonem do członków komisji badającej katastrofę promu kosmicznego Challenger po tym jak Feynman zaprezentował, że schłodzona uszczelka rakiety pomocniczej staje się krucha i łamliwa, co było główną przyczyną wypadku (11 lutego 1986 r.)

„Cel fizyki: ująć przyrodę jako różne przejawy tego samego zespołu praw.”

Richard Feynman

„Poeta powiedział: „Cały Wszechświat mieści się w szklance wina”. Prawdopodobnie nie dowiemy się nigdy, co dokładnie miał na myśli, ponieważ poeci nie po to piszą, by ich rozumiano.”

Richard Feynman

Źródło: Feynmana Wykłady Z Fizyki – Tom 1.1.

O myślach , O wszechświecie , O myśleniu

„Stworzenie czegoś nowego, a jednocześnie zgodnego z tym, co wiadomo dotychczas jest niezwykle trudne.”

Richard Feynman

„Nauka to wiara w ignorancję ekspertów.”

Richard Feynman

O wierze , O nauce

„Jeśli chcesz jako fizyk zrobić kawałek naprawdę dobrej roboty, to musisz ją robić nieprzerwanie. A to dlatego, że jeśli układa się w całość pomysły mgliste i trudne do zapamiętania, to tak jakby budowało się domek z kart, bardzo chwiejny, a zapomnienie choćby jednej z nich powoduje rozsypanie się całej konstrukcji. Nie wiesz, jak doszedłeś do tego, co już miałeś i musisz zaczynać budowę od początku. a jeśli masz obowiązki administracyjne lub coś w tym rodzaju, to zawsze coś ci przerywa.”

Richard Feynman

„Ogrom wiadomości można w dużej mierze skondensować w postaci praw.”

Richard Feynman

Richard Feynman: Cytaty po angielsku

“The physicist needs a facility in looking at problems from several points of view. The exact analysis of real physical problems is usually quite complicated, and any particular physical situation may be too complicated to analyze directly by solving the differential equation. But one can still get a very good idea of the behavior of a system if one has some feel for the character of the solution in different circumstances. Ideas such as the field lines, capacitance, resistance, and inductance are, for such purposes, very useful. … On the other hand, none of the heuristic models, such as field lines, is really adequate and accurate for all situations. There is only one precise way of presenting the laws, and that is by means of differential equations. They have the advantage of being fundamental and, so far as we know, precise. If you have learned the differential equations you can always go back to them. There is nothing to unlearn.”

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Richard Feynman

volume II; lecture 2, "Differential Calculus of Vector Fields"; section 2-1, "Understanding physics"; p. 2-1
The Feynman Lectures on Physics (1964)

“Nature uses only the longest threads to weave her patterns, so each small piece of her fabric reveals the organization of the entire tapestry.”

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Richard Feynman książka The Character of Physical Law

Źródło: The Character of Physical Law (1965), chapter 1, “The Law of Gravitation,” p. 34

“Why are the theories of physics so similar in their structure?”

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Richard Feynman książka QED: The Strange Theory of Light and Matter

QED: The Strange Theory of Light and Matter (1985)

“In general, we look for a new law by the following process: First we guess it. Then we – now don't laugh, that's really true. Then we compute the consequences of the guess to see what, if this is right, if this law that we guessed is right, to see what it would imply. And then we compare the computation results to nature, or we say compare to experiment or experience, compare it directly with observations to see if it works. If it disagrees with experiment, it's wrong. In that simple statement is the key to science. It doesn't make any difference how beautiful your guess is, it doesn't make any difference how smart you are, who made the guess, or what his name is. If it disagrees with experiment, it's wrong. That's all there is to it.”

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Richard Feynman książka The Character of Physical Law

same passage in transcript: video http://www.youtube.com/watch?v=-2NnquxdWFk&t=16m46s
The Character of Physical Law (1965)
Wariant: In general we look for a new law by the following process. First we guess it. Then we compute the consequences of the guess to see what would be implied if this law that we guessed is right. Then we compare the result of the computation to nature, with experiment or experience, compare it directly with observation, to see if it works. If it disagrees with experiment it is wrong. In that simple statement is the key to science. It does not make any difference how beautiful your guess is. It does not make any difference how smart you are, who made the guess, or what his name is – if it disagrees with experiment it is wrong. That is all there is to it.

“I think I can safely say that nobody understands quantum mechanics.”

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Richard Feynman książka The Character of Physical Law

Wariant: I think I can safely say that nobody understands quantum mechanics.
Źródło: The Character of Physical Law (1965), chapter 6, “Probability and Uncertainty — the Quantum Mechanical View of Nature,” p. 129

“Whenever you see a sweeping statement that a tremendous amount can come from a very small number of assumptions, you always find that it is false. There are usually a large number of implied assumptions that are far from obvious if you think about them sufficiently carefully.”

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Richard Feynman

volume II; lecture 26, "Lorentz Transformations of the Fields"; section 26-1, "The four-potential of a moving charge"; p. 26-2
The Feynman Lectures on Physics (1964)

“I hope … that you will find someday that, after all, it isn’t as horrible as it looks.”

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Richard Feynman

volume III, "Feynman's Epilogue", p. 21-19
The Feynman Lectures on Physics (1964)

“You will have to brace yourselves for this — not because it is difficult to understand, but because it is absolutely ridiculous: All we do is draw little arrows on a piece of paper — that’s all!”

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Richard Feynman książka QED: The Strange Theory of Light and Matter

Źródło: QED: The Strange Theory of Light and Matter (1985), p. 24

“It has been a mystery ever since it was discovered more than fifty years ago, and all good theoretical physicists put this number up on their wall and worry about it. Immediately you would like to know where this number for a coupling comes from: is it related to π, or perhaps to the base of natural logarithms? Nobody knows. It's one of the greatest damn mysteries of physics: a magic number that comes to us with no understanding by man. You might say the "hand of God" wrote that number, and "we don't know how He pushed his pencil." We know what kind of a dance to do experimentally to measure this number very accurately, but we don't know what kind of dance to do on the computer to make this number come out — without putting it in secretly!”

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Richard Feynman książka QED: The Strange Theory of Light and Matter

On the numerical value of α, the fine-structure constant, p. 129
QED: The Strange Theory of Light and Matter (1985)

“I can live with doubt, and uncertainty, and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong. I have approximate answers, and possible beliefs, and different degrees of certainty about different things, but I'm not absolutely sure of anything. There are many things I don't know anything about, such as whether it means anything to ask "Why are we here?" I might think about it a little bit, and if I can't figure it out then I go on to something else. But I don't have to know an answer. I don't feel frightened by not knowing things, by being lost in the mysterious universe without having any purpose — which is the way it really is, as far as I can tell. Possibly. It doesn't frighten me.”

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Richard Feynman książka The Pleasure of Finding Things Out

Źródło: No Ordinary Genius (1994), p. 239, from interview in "The Pleasure of Finding Things Out" (1981): video http://www.youtube.com/watch?v=NEwUwWh5Xs4&t=48m10s

“Nature isn't classical, dammit, and if you want to make a simulation of nature, you'd better make it quantum mechanical, and by golly it's a wonderful problem, because it doesn't look so easy.”

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Richard Feynman

" Simulating Physics with Computers http://www.cs.berkeley.edu/~christos/classics/Feynman.pdf", International Journal of Theoretical Physics, volume 21, 1982, p. 467-488, at p. 486 (final words)

“There are 1011 stars in the galaxy. That used to be a huge number. But it's only a hundred billion. It's less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers.”

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Richard Feynman

from a 1987 class, as quoted in David L. Goodstein, "Richard P. Feynman, Teacher," Physics Today, volume 42, number 2 (February 1989) p. 70-75, at p. 73
Republished in the "Special Preface" to Six Easy Pieces (1995), p. xx.

“The next question was — what makes planets go around the sun? At the time of Kepler some people answered this problem by saying that there were angels behind them beating their wings and pushing the planets around an orbit. As you will see, the answer is not very far from the truth. The only difference is that the angels sit in a different direction and their wings push inward.”

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Richard Feynman książka The Character of Physical Law

Źródło: The Character of Physical Law (1965), chapter 1, “The Law of Gravitation,” p. 18: video http://www.youtube.com/watch?v=j3mhkYbznBk&t=17m10s

“There were certain things I didn't like, such as tipping. I thought we should be paid more, and not have to have any tips. But when I proposed that to the boss, I got nothing but laughter. She told everybody, "Richard doesn't want his tips, hee, hee, hee; he doesn't want his tips, ha, ha, ha." The world is full of this kind of dumb smart-alec who doesn't understand anything.”

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Richard Feynman

Part 1: "From Rockaway to MIT", "String Beans", p. 25
Surely You're Joking, Mr. Feynman! (1985)

“The chance is high that the truth lies in the fashionable direction. But, on the off-chance that it is in another direction — a direction obvious from an unfashionable view of field theory — who will find it? Only someone who has sacrificed himself by teaching himself quantum electrodynamics from a peculiar and unfashionable point of view; one that he may have to invent for himself.”

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Richard Feynman

"The Development of the Space-Time View of Quantum Electrodynamics," Nobel Lecture http://nobelprize.org/physics/laureates/1965/feynman-lecture.html (11 December 1965)

“It is to be emphasized that no matter how many [amplitude] arrows we draw, add, or multiply, our objective is to calculate a single final arrow for the event. Mistakes are often made by physics students at first because they do not keep this important point in mind. They work for so long analyzing events involving a single photon that they begin to think that the arrow is somehow associated with the photon”

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Richard Feynman książka QED: The Strange Theory of Light and Matter

rather than with the event
Źródło: QED: The Strange Theory of Light and Matter (1985), p. 75-76

“Well, we’re getting a little philosophical and serious, ok? Let’s go back to what we’re doing. One day we look at a map and this capital is K-Y-Z-Y-L and we decided it would be fun to go there because it’s so obscure and peculiar. It’s a game. It’s not serious. It doesn't involve some deep philosophical point of view about authority or anything. It’s just the fun of having an adventure to try to go to a land that we’d never heard of, that we knew was an independent country once, no longer an independent country, find out what it’s like. And discover as we went along that nobody went there for a long time and it’s isolated made it more interesting. But, you know, many explorers liked to go to places that are unusual. And, it’s only for the fun of it. I don’t go for this philosophical interpretation of "our deeper understanding of what we’re doing."”

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Richard Feynman

We haven’t any deep understanding of what we’re doing. If we tried to understand what we’re doing, we’d go nutty.
Źródło: No Ordinary Genius (1994), p. 236, from interview two weeks before his death in "The Quest for Tannu Tuva" (1989): video http://www.youtube.com/watch?v=Mn4_40hAAr0&t=51m49s

“The fact that you are not sure means that it is possible that there is another way someday.”

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Richard Feynman książka The Meaning of It All

lecture II: "The Uncertainty of Values"
The Meaning of It All (1999)

“If we take everything into account — not only what the ancients knew, but all of what we know today that they didn't know — then I think that we must frankly admit that we do not know.”

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Richard Feynman

The Value of Science (1955)

“Therefore psychologically we must keep all the theories in our heads, and every theoretical physicist who is any good knows six or seven different theoretical representations for exactly the same physics.”

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Richard Feynman książka The Character of Physical Law

Źródło: The Character of Physical Law (1965), chapter 7, “Seeking New Laws,” p. 168

“Shut up and calculate!”

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Richard Feynman

Probably a misattribution which instead originated with David Mermin; in "Could Feynman Have Said This?" http://scitation.aip.org/journals/doc/PHTOAD-ft/vol_57/iss_5/10_1.shtml?bypassSSO=1, by N. David Mermin, in Physics Today (May 2004), p. 10, he notes that in an earlier Physics Today (April 1989), p. 9, he had written what appears to be the earliest occurrence of the phrase:
If I were forced to sum up in one sentence what the Copenhagen interpretation says to me, it would be "Shut up and calculate!"
Disputed and/or attributed

“Principles
You can't say A is made of B
or vice versa.
All mass is interaction.”

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Richard Feynman

note (c. 1948), quoted in Genius: The Life and Science of Richard Feynman (1992) by James Gleick, p. 5 (repeated p. 283)

“Light is something like raindrops — each little lump of light is called a photon — and if the light is all one color, all the "raindrops" are the same.”

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Richard Feynman książka QED: The Strange Theory of Light and Matter

Źródło: QED: The Strange Theory of Light and Matter (1985), p. 14

“In fact, the science of thermodynamics began with an analysis, by the great engineer Sadi Carnot, of the problem of how to build the best and most efficient engine, and this constitutes one of the few famous cases in which engineering has contributed to fundamental physical theory. Another example that comes to mind is the more recent analysis of information theory by Claude Shannon. These two analyses, incidentally, turn out to be closely related.”

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Richard Feynman

volume I; lecture 44, "The Laws of Thermodynamics"; section 44-1, "Heat engines; the first law"; p. 44-2
The Feynman Lectures on Physics (1964)

“I don't know anything, but I do know that everything is interesting if you go into it deeply enough.”

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Richard Feynman książka The Pleasure of Finding Things Out

From Omni interview, "The Smartest Man in the World" (1979) p. 203
The Pleasure of Finding Things Out (1999)

“Nature's imagination far surpasses our own.”

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Richard Feynman książka The Character of Physical Law

Źródło: The Character of Physical Law (1965), chapter 7, “Seeking New Laws,” p. 162: video http://www.youtube.com/watch?v=-2NnquxdWFk&t=29m20s

“One time I was in the men's room of the bar and there was a guy at the urinal. He was kind of drunk, and said to me in a mean-sounding voice, "I don't like your face. I think I'll push it in."I was scared green. I replied in an equally mean voice, "Get out of my way, or I'll pee right through ya!"”

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Richard Feynman

Part 4: "From Cornell to Caltech, With a Touch of Brazil", "Any Questions?", p. 177
Surely You're Joking, Mr. Feynman! (1985)

“I don't know what's the matter with people: they don't learn by understanding; they learn by some other way — by rote or something. Their knowledge is so fragile!”

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Richard Feynman

Part 1: "From Rockaway to MIT", "Who Stole the Door?", p. 36-37
Surely You're Joking, Mr. Feynman! (1985)

“There is one feature I notice that is generally missing in cargo cult science. … It's a kind of scientific integrity, a principle of scientific thought that corresponds to a kind of utter honesty — a kind of leaning over backwards. For example, if you're doing an experiment, you should report everything that you think might make it invalid — not only what you think is right about it; other causes that could possibly explain your results; and things you thought of that you've eliminated by some other experiment, and how they worked — to make sure the other fellow can tell they have been eliminated. Details that could throw doubt on your interpretation must be given, if you know them. You must do the best you can — if you know anything at all wrong, or possibly wrong — to explain it. If you make a theory, for example, and advertise it, or put it out, then you must also put down all the facts that disagree with it, as well as those that agree with it. There is also a more subtle problem. When you have put a lot of ideas together to make an elaborate theory, you want to make sure, when explaining what it fits, that those things it fits are not just the things that gave you the idea for the theory; but that the finished theory makes something else come out right, in addition. In summary, the idea is to try to give all of the information to help others to judge the value of your contribution; not just the information that leads to judgement in one particular direction or another.”

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Richard Feynman

" Cargo Cult Science http://calteches.library.caltech.edu/51/2/CargoCult.htm", adapted from a 1974 Caltech commencement address; also published in Surely You're Joking, Mr. Feynman!, p. 341