物理的笑话，请解读

One day in class, Richard Feynman was talking about angular momentum. He descr

ibed rotation matrices and mentioned that they did not commute. He said that S

ir William Hamilton discovered noncommutivity one night when he was taking a w

alk in his garden with Lady Hamilton. As they sat down on a bench, there was a

moment of passion. It was then that he discovered that AB did not equal BA.
英语意思我懂

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