Photo of part of a homework assignment. The Klein-Nishina formula is visible, as well as partial instructions for the calculation.
https://files.mastodon.social/media_attachments/files/109/467/344/634/512/749/original/f9674ac543746572.jpeg
It's a lovely calculation that has since taught generations of particle physics students the difference between a long homework assignment and a very long homework assignment. This one clocked in at around 40 pages.
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