The R stands for Renormalization

R. P. Feynman characterized his work in QED as

a scheme for pushing a great problem under the rug. Maybe it will stay under the rug and, then again, maybe it won’t.

If this quote doesn’t fill you with a nagging desire to go look under the rug, then don’t become a theoretical physicist. If it does, take some aspirin, read the quote again for inspiration and then start doing problems.

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