John Williamson brings together the very large and the very small in this review of Relativistic Quantum Mechanics, culminating in Paul Dirac's famous equation describing spin-½ particles such as electrons. What happened to the imaginary part of the equation which Dirac himself was uneasy about, and has dissappeared from many if not most text books on the subject. "These extra terms involve some new physical effects, but since they are not real they do not lend themselves very directly to physical interpretation," wrote Dirac. Too right!

Contains some moderately involved mathematics. You might have to watch it twice.

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