Bell, John S. Speakable and Unspeakable in Quantum Mechanics. Cambridge: Cambridge University Press, [1987] 1993. ISBN 0-521-52338-9.
This volume collects most of Bell's papers on the foundations and interpretation of quantum mechanics including, of course, his discovery of “Bell's inequality”, which showed that no local hidden variable theory can reproduce the statistical results of quantum mechanics, setting the stage for the experimental confirmation by Aspect and others of the fundamental non-locality of quantum physics. Bell's interest in the pilot wave theories of de Broglie and Bohm is reflected in a number of papers, and Bell's exposition of these theories is clearer and more concise than anything I've read by Bohm or Hiley. He goes on to show the strong similarities between the pilot wave approach and the “many world interpretation” of Everett and de Witt. An extra added treat is chapter 9, where Bell derives special relativity entirely from Maxwell's equations and the Bohr atom, along the lines of Fitzgerald, Larmor, Lorentz, and Poincaré, arriving at the principle of relativity (which Einstein took as a hypothesis) from the previously known laws of physics.

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