YuraZhum

@YuraZhum, на цитатах с 26 июля 2022 г.

„Высокий ум безумию сосед. Границы твердой между ними нет.“

Джон Драйден (1631–1700) английский поэт, драматург, критик, баснописец

„Остерегайтесь гнева терпеливого человека.“

Джон Драйден (1631–1700) английский поэт, драматург, критик, баснописец

„Предпочитаю (или: лучше) умереть стоя, чем жить на коленях!“

Эмилиано Сапата (1879–1919) лидер Мексиканской революции

Prefiero morir de pie que vivir siempre arrodillado! / ¡Más vale morir de pie que vivir de rodillas!
приписывается

„Я хочу умереть рабом принципов, а не людей.“

Эмилиано Сапата (1879–1919) лидер Мексиканской революции

„Если нет справедливости для народа, то не должно быть покоя и для правительства.“

Эмилиано Сапата (1879–1919) лидер Мексиканской революции

Si no hay justicia para el pueblo que no haya paz para el gobierno.
Вариант: Если нет справедливости для народа, то не должно быть покоя и для правительства.

„Если хочешь быть орлом - летай, если хочешь быть червём - ползай, но не плачь, если тебя раздавят.“

Эмилиано Сапата (1879–1919) лидер Мексиканской революции

El que quiera ser águila que vuele, el que quiera ser gusano que se arrastre pero que no grite cuando lo pisen.

“One possibility in this direction is to regard, classically, an electron as the end of a single Faraday line of force. The electric field in this picture from discrete Faraday lines of force, which are to be treated as physical things, like strings. One has then to develop a dynamics for such a string like structure, and quantize it…. In such a theory a bare electron would be inconceivable, since one cannot imagine the end of a piece of string without having the string.”

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Paul Dirac (1902–1984) theoretical physicist

Bombay Lectures (1955)

“God used beautiful mathematics in creating the world.”

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Paul Dirac (1902–1984) theoretical physicist

As quoted in The Cosmic Code : Quantum Physics As The Language Of Nature (1982) by Heinz R. Pagels, p. 295; also in Paul Adrien Maurice Dirac : Reminiscences about a Great Physicist (1990) edited by Behram N. Kursunoglu and Eugene Paul Wigner, p. xv

“A good deal of my research work in physics has consisted in not setting out to solve some particular problems, but simply examining mathematical quantities of a kind that physicists use and trying to get them together in an interesting way regardless of any application that the work may have. It is simply a search for pretty mathematics. It may turn out later that the work does have an application. Then one has had good luck.”

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Paul Dirac (1902–1984) theoretical physicist

P.A.M. Dirac, "Pretty Mathematics," International Journal of Theoretical Physics, Vol. 21, Issue 8–9, August 1982, p. 603 http://link.springer.com/article/10.1007/BF02650229#page-1

“The aim of science is to make difficult things understandable in a simpler way; the aim of poetry is to state simple things in an incomprehensible way. The two are incompatible.”

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Paul Dirac (1902–1984) theoretical physicist

As quoted in Dirac: A Scientific Biography (1990), by Helge Kragh, p. 258
Источник: [Kragh, Helge, Dirac: A Scientific Biography, https://books.google.co.uk/books?id=zXm1Bso1VREC&pg=PA258&lpg=PA258&dq=%22The+aim+of+science+is+to+make+difficult+things+understandable+in+a+simpler+way;+the+aim+of+poetry+is+to+state+simple+things+in+an+incomprehensible+way.+The+two+are+incompatible%22&source=bl&ots=OLeGFpZGCh&sig=VRga1I7FVl9UBpXi_oAq_-8u_ls&hl=en&sa=X&ved=0ahUKEwjBwLbbwdvVAhXIIMAKHZ_pCZQQ6AEIOTAD#v=onepage&q=%22The%20aim%20of%20science%20is%20to%20make%20difficult%20things%20understandable%20in%20a%20simpler%20way%3B%20the%20aim%20of%20poetry%20is%20to%20state%20simple%20things%20in%20an%20incomprehensible%20way.%20The%20two%20are%20incompatible%22&f=false, March 30, 1990, 258, December 6, 2017]

“I don't suppose that applies so much to other physicists; I think it’s a peculiarity of myself that I like to play about with equations, just looking for beautiful mathematical relations which maybe don’t have any physical meaning at all. Sometimes they do.”

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Paul Dirac (1902–1984) theoretical physicist

Interview with Dr. P. A. M. Dirac by Thomas S. Kuhn at Dirac's home, Cambridge, England, May 7, 1963 http://www.aip.org/history/ohilist/4575_3.html

“Classical mechanics has been developed continuously from the time of Newton and applied to an ever-widening range of dynamical systems, including the electromagnetic field in interaction with matter. The underlying ideas and the laws governing their application form a simple and elegant scheme, which one would be inclined to think could not be seriously modified without having all its attractive features spout. Nevertheless it has been found possible to set up a new scheme, called quantum mechanics, which is more suitable for the description of phenomena on the atomic scale and which is in some respects more elegant and satisfying than the classical scheme. This possibility is due to the changes which the new scheme involves being of a very profound character and not clashing with the features of the classical theory that make it so attractive, as a result of which all these features can be incorporated in the new scheme.”

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Paul Dirac книга Principles of Quantum Mechanics

I. The Principle of Superposition - 1. The Need for a Quantum Theory
The Principles of Quantum Mechanics (4th ed. 1958)

“At the beginning of time the laws of Nature were probably very different from what they are now. Thus we should consider the laws of Nature as continually changing with the epoch, instead of as holding uniformly throughout space-time. This idea was first put forward by Milne, who worked it out on… assumptions… not very satisfying… we should expect them also to depend on position in space, in order to preserve the beautiful idea of the theory of relativity [that] there is fundamental similarity between space and time.”

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Paul Dirac (1902–1984) theoretical physicist

The Relation between Mathematics and Physics http://www.damtp.cam.ac.uk/events/strings02/dirac/speach.html (Feb. 6, 1939) Proceedings of the Royal Society (Edinburgh) Vol. 59, 1938-39, Part II, pp. 122-129.

“My research work was based in pictures. I needed to visualise things and projective geometry was often most useful e. g. in figuring out how a particular quantity transforms under Lorentz transf[ormation]. When I came to publish the results I suppressed the projective geometry as the results could be expressed more concisely in analytic form.”

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Paul Dirac (1902–1984) theoretical physicist

"Recollections of an Exciting Era," three lectures given at Varenna, 5 August 1972, quoted in Peter Galison, "The Suppressed Drawing: Paul Dirac's Hidden Geometry", Representations, No. 72 (Autumn, 2000)

“I want to emphasize the necessity for a sound mathematical basis for any fundamental physical theory. Any philosophical ideas that one may have play only a subordinate role. Unless such ideas have a mathematical basis they will be ineffective.”

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Paul Dirac (1902–1984) theoretical physicist

The Mathematical Foundations of Quantum Theory (1978)

“Causality applies only to a system which is left undisturbed. If a system is small, we cannot observe it without producing a serious disturbance and hence we cannot expect to find any causal connexion between the results of our observations. Causality will still be assumed to apply to undisturbed systems and the equations which will be set up to describe an undisturbed system will be differential equations expressing a causal connexion between conditions at one time and conditions at a later time. These equations will be in close correspondence with the equations of classical mechanics, but they will be connected only indirectly with the results of observations.”

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Paul Dirac книга Principles of Quantum Mechanics

I. The Principle of Superposition - 1. The Need for a Quantum Theory
The Principles of Quantum Mechanics (4th ed. 1958)

“The measure of greatness in a scientific idea is the extent to which it stimulates thought and opens up new lines of research.”

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Paul Dirac (1902–1984) theoretical physicist

The scientific work of Georges Lemaître (1968), P.A.M. Dirac, Commentarii (Pontifical Academy of Sciences), vol 2, 11, pp. 1–18.

“If there is no complete agreement between the results of one's work and the experiment, one should not allow oneself to be too discouraged.”

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Paul Dirac (1902–1984) theoretical physicist

"The Evolution of the Physicist's Picture of Nature," Scientific American (May, 1963)

“In science one tries to tell people, in such a way as to be understood by everyone, something that no one ever knew before. But in the case of poetry, it's the exact opposite!”

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Paul Dirac (1902–1984) theoretical physicist

As quoted in Brighter Than a Thousand Suns : A Personal History of the Atomic Scientists (1958) by Robert Jungk, as translated by James Cleugh, p. 22
Anecdotally, when Oppenheimer was working at Göttingen, Dirac supposedly came to him one day and said: "Oppenheimer, they tell me you are writing poetry. I do not see how a man can work on the frontiers of physics and write poetry at the same time. They are in opposition. In science you want to say something that nobody knew before, in words which everyone can understand. In poetry you are bound to say... something that everybody knows already in words that nobody can understand."

“It seems clear that the present quantum mechanics is not in its final form.”

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Paul Dirac (1902–1984) theoretical physicist

"The Early Years of Relativity" in Albert Einstein : Historical and Cultural Perspectives : The Centennial Symposium in Jerusalem (1979) edited by Gerald James Holton and Yehuda Elkana, p. 85
Контексте: It seems clear that the present quantum mechanics is not in its final form. Some further changes will be needed, just about as drastic as the changes made in passing from Bohr's orbit theory to quantum mechanics. Some day a new quantum mechanics, a relativistic one, will be discovered, in which we will not have these infinities occurring at all. It might very well be that the new quantum mechanics will have determinism in the way that Einstein wanted.