A diagram showing electromagnetic interactions between subatomic particles.
- Lloyd points out that ‘if you've ever tried to calculate Feynman diagrams and do quantum dynamics, simulating quantum systems is hard.’
- Also, although it may seem surprising, string diagrams are mathematically much simpler than Feynman diagrams.
- A Feynman diagram decorated with a single photon loop can just as well be festooned with two loops.
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