Frasi di John Stewart Bell

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John Stewart Bell

Data di nascita: 28. Giugno 1928
Data di morte: 1. Ottobre 1990

John Stewart Bell è stato un fisico nordirlandese, conosciuto soprattutto per l'omonimo teorema, uno dei più importanti nell'ambito della fisica quantistica. Wikipedia

Frasi John Stewart Bell

„ORDINARY QUANTUM MECHANICS (as far as I know) IS JUST FINE FOR ALL PRACTICAL PURPOSES.“

—  John S. Bell

Against 'measurement' (1990)
Contesto: I agree with them about that: ORDINARY QUANTUM MECHANICS (as far as I know) IS JUST FINE FOR ALL PRACTICAL PURPOSES. Even when I begin by insisting on this myself, and in capital letters, it is likely to be insisted on repeatedly in the course of the discussion. So it is convenient to have an abbreviation for the last phrase: FOR ALL PRACTICAL PURPOSES = FAPP.

„FOR ALL PRACTICAL PURPOSES = FAPP.“

—  John S. Bell

Against 'measurement' (1990)
Contesto: I agree with them about that: ORDINARY QUANTUM MECHANICS (as far as I know) IS JUST FINE FOR ALL PRACTICAL PURPOSES. Even when I begin by insisting on this myself, and in capital letters, it is likely to be insisted on repeatedly in the course of the discussion. So it is convenient to have an abbreviation for the last phrase: FOR ALL PRACTICAL PURPOSES = FAPP.

„I am a Quantum Engineer, but on Sundays I Have Principles.“

—  John S. Bell

Opening sentence of his "underground colloquium" in March 1983, as quoted by Nicolas Gisin in an edition by [J. S. Bell, Reinhold A. Bertlmann, Anton Zeilinger, Quantum [un]speakables: from Bell to quantum information, Springer, 2002, 3540427562, 199]

„Theoretical physicists live in a classical world, looking out into a quantum-mechanical world. The latter we describe only subjectively, in terms of procedures and results in our classical domain.“

—  John S. Bell, Introduction to the hidden-variable question

"Introduction to the hidden-variable question" (1971), included in Speakable and Unspeakable in Quantum Mechanics (1987), p. 29

„1 + P(b, c) ≥ |P(a, b) - P(a, c)|“

—  John S. Bell

On the Einstein-Podolsky-Rosen paradox (1964)

„Bohr was inconsistent, unclear, willfully obscure and right. Einstein was consistent, clear, down-to-earth and wrong.“

—  John S. Bell

quoted in Graham Farmelo, " Random Acts of Science http://www.nytimes.com/2010/06/13/books/review/Farmelo-t.html", The New York Times (June 11, 2010)

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