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The New Quantum Universe, Second Edition by Patrick Walters, Tony Hey

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11 Feynman rules

It is as though a bombardier flying low over a road suddenly sees three roads and it is only when two of them come together and disappear again that he realizes he has simply passed over a long switchback in a single road.

Richard Feynman

Dirac and antiparticles

We have seen in the earlier chapters that quantum mechanics, despite its inherent probabilistic nature, is capable of making successful predictions for an enormous range of phenomena. In the microscopic domain, there is no doubt that Newton’s laws of classical mechanics must give way to quantum theory. There is another area where Newton’s laws have been shown to be in need of modification, namely, when the velocities of objects are close to the speed of light. Since light ...

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