„All this is very good in theory, but in practice, you take a piece of iron, wind a wire around it, then plug the wire in. The core gets hot, the wires smoke, and the fuse blows. So you see, there are practical limitations to theory.“

Comments to an undergraduate physics class about transformers, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.

Última atualização 22 de Maio de 2020. História

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„When a constant electric current flows along a cylindrical wire, its strength is the same at every part of the section of the wire. But if the current is variable, self-induction produces a deviation from this… induction opposes variations of the current in the centre of the wire more strongly than at the circumference, and consequently the current by preference flows along the outer portion of the wire. When the current changes its direction… this deviation increases rapidly with the rate of alternation; and when the current alternates many million times per second, almost the whole of the interior of the wire must, according to theory, appear free from current, and the flow must confine itself to the very skin of the wire. Now in such extreme cases… preference must be given to another conception of the matter which was first presented by Messrs. 0. Heaviside and J. H. Poynting, as the correct interpretation of Maxwell's equations as applied to this case. According to this view, the electric force which determines the current is not propagated in the wire itself, but under all circumstances penetrates from without into the wire, and spreads into the metal with comparative slowness and laws similar to those which govern changes of temperature in a conducting body.
…Inasmuch as I made use of electric waves in wires of exceedingly short period in my experiments on the propagation of electric force, it was natural to test by means of these the correctness of the conclusions deduced. As a matter of fact the theory was found to be confirmed by the experiments…“

—  Heinrich Hertz German physicist 1857 - 1894

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„If you refuse to take account of theory, then you have forgotten that practice is often an offspring of theory.“

—  Fausto Cercignani Italian scholar, essayist and poet 1941

Examples of self-translation (c. 2004), Quotes - Zitate - Citations - Citazioni

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„Democracy is beautiful in theory; in practice it is a fallacy. You in America will see that some day.“

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„In theory there is no difference between theory and practice; in practice there is.“

—  Yogi Berra American baseball player, manager, coach 1925 - 2015

Attributed in Nassim Nicholas Taleb, Antifragile - Things that Gain From Disorder (2012), p. 213.
The earliest known appearance of this quote in print is Walter J. Savitch, Pascal: An Introduction to the Art and Science of Programming (1984), where it is attributed as a "remark overheard at a computer science conference". It circulated as an anonymous saying for more than ten years before attributions to Jan L. A. van de Snepscheut and Yogi Berra began to appear (and later still to various others).
Disputed, Misattributed

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The earliest known appearance in print of this quote is Benjamin Brewster in the October 1881 - June 1882 issue of "The Yale Literary Magazine." Brewster asks, "What does his lucid explanation amount to but this, that in theory there is no difference between theory and practice, while in practice there is?" See page 202. https://books.google.com/books?id=iJ9MAAAAMAAJ&printsec=frontcover&vq=%22no+difference%22#v=onepage&q&f=false It has also been attributed by Doug Rosenberg and Matt Stephens (2007) Use Case Driven Object Modeling with UMLTheory and Practice p. xxvii as well as Walter J. Savitch, Pascal: An Introduction to the Art and Science of Programming (1984), where it is attributed as a "remark overheard at a computer science conference". It circulated as an anonymous saying for more than ten years before attributions to van de Snepscheut and Yogi Berra began to appear (and later still to various others).
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Contexto: His gaze widened, then taking in the entirety of the camp. All these people: they were trapped. And not merely by the wires that surrounded them. Physical barricades were nothing compared to the wires of the mind. What had truly imprisoned them was one another. Husbands and wives, parents and children, friends and companions: what they believed had given them strength in their lives had actually done the opposite. Guilder recalled the couple who lived across the street from his townhouse, trading off their sleeping daughter on the way to the car. How heavy that burden must have felt in their arms. And when the end swept down upon them all, they would exit the world on a wave of suffering, their agonies magnified a million times over by the loss of her. Would they have to watch her die? Would they perish first, knowing what would become of her in their absence? Which was preferable? But the answer was neither. Love had sealed their doom. Which was what love did. Guilder's father had taught that lesson well enough.

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