I didn't see, for example, the circling-a-group for taking derivatives. | Hacker News

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		evanb on May 15, 2019 \| parent \| context \| favorite \| on: How Feynman Diagrams Revolutionized Physics I didn't see, for example, the circling-a-group for taking derivatives.

stared on May 15, 2019 [–]

Sure, there are other elements (derivative, (anti)symmetrization, lowering/raising indices). The core element of summation stays the same.

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