“In 1929 Oskar Klein stumbled into an apparent paradox when trying to describe the scattering of a relativistic electron by a square potential using Dirac’s wave equation. … In order to capture the essence of the problem without entering into unnecessary complication we will study Klein’s paradox in the context of the Klein– Gordon equation.”

Source: An Invitation to Quantum Field Theory (2012), Ch. 1 : Why Do We Need Quantum Field Theory After All?

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Luis Álvarez-Gaumé4

Spanish physicist

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“What will we do when they start capturing our people?" Klein asked. "They will, you know, if they haven't by now. Things go wrong." Heydrich's fingers drummed some more. He didn't worry about the laborers who'd expanded this redoubt- they'd all gone straight to the camps after they did their work. But captured fighters were indeed another story. He sighed. "Things go wrong. Ja. If they didn't, Stalin would be lurking somewhere in the Pripet Marshes, trying to keep his partisans fighting against us. We would've worked Churchill to death in a coal mine." He barked laughter. "The British did some of that for us, when they threw the bastard out of office last month. And we'd be getting ready to fight the Amis on their side of the Atlantic. But… things went wrong." "Yes, sir." After a moment, Klein ventured, "Uh, sir- you didn't answer my question." "Oh. Prisoners." Heydrich had to remind himself what his aide was talking about. "I don't know what to do, Klein, except make sure our people all have cyanide pills." "Some won't have the chance to use them. Some won't have the nerve," Klein said. Not many men had the nerve to tell Reinhard Heydrich the unvarnished truth. Heydrich kept Klein around not least because Klein was one of those men. They were useful to have. Hitler would have done better had he seen that. Heydrich recognized the truth when he heard it now; one more thing Hitler'd had trouble with.”

Harry Turtledove (1949) American novelist, short story author, essayist, historian

Source: The Man With the Iron Heart (2008), p. 56-57

“Companies like Nike already use Graffiti as a standard variety in their marketing campaigns and the first people who read Naomi Klein's 'No Logo' were marketing gurus who wanted to know what they shouldn't do.”

Johannes Grenzfurthner (1975) Austrian artist, writer, curator, and theatre and film director

talking about Guerilla Communication strategies in "Urban Hacking" http://www.transcript-verlag.de/ts1536/ts1536.php, transkript, p. 106

“The Gordon Equation is as close as being a physical law, like gravitation or planetary motion, as we will ever encounter in finance.”

William J. Bernstein (1948) economist

Source: The Four Pillars of Investing (2002), Chapter 2, Measuring The Beast, p. 54.

“If Dirac’s idea restores the stability of the spectrum by introducing a stable vacuum where all negative energy states are occupied, the so-called Dirac sea, it also leads directly to the conclusion that a single-particle interpretation of the Dirac equation is not possible.”

Luis Álvarez-Gaumé Spanish physicist

Source: An Invitation to Quantum Field Theory (2012), Ch. 1 : Why Do We Need Quantum Field Theory After All?

“Above all, Chopin was the greatest master of counterpoint since Mozart. This will appear paradoxical only if we equate counterpoint with strict fugue, and Chopin wrote no formal fugues except as an academic exercise. His chief training, in both composition and keyboard playing, however, came from a study of Bach, and it was a study that engaged him all his life and which he always recommended to his pupils.”

Charles Rosen (1927–2012) American pianist and writer on music

Source: The Romantic Generation (1995), Ch. 5 : Chopin: Counterpoint and the Narrative Forms

“The method of successive approximations is often applied to proving existence of solutions to various classes of functional equations; moreover, the proof of convergence of these approximations leans on the fact that the equation under study may be majorised by another equation of a simple kind. Similar proofs may be encountered in the theory of infinitely many simultaneous linear equations and in the theory of integral and differential equations. Consideration ofjkbni semiordered spaces and operations between them enables us to easily develop a complete theory of such functional equations in abstract form.”

Leonid Kantorovich (1912–1986) Russian mathematician

"On one class of functional equations" (1936), as cited in: O'Connor, John J.; Robertson, Edmund F., " Leonid Kantorovich http://www-history.mcs.st-andrews.ac.uk/Biographies/Kantorovich.html", MacTutor History of Mathematics archive, University of St Andrews