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BiBi
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In Richard Feynman's book QED, when writing about multiplying arrows of photons (on page 61 if you have the book handy)he shrinks and turns them at specific numbers, and though I understand why and how it's effective, I don't understand how he determined to shrink and turn the arrows by those specific amounts. If anyone knows, when shrinking and turning arrows, how you come up with those amounts and numbers I would be grateful.