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A comment on Ask HN: How did you learn math notation?. Parent comment

Re:Ask HN: How did you learn math notation? by Jensson on Thursday November 25, 2021 @09:08AM (#29341473)
That is a physics based paper, it used physics notation. Can find common ones here (including that triangle):

https://en.wikipedia.org/wiki/List_of_common_physics_notatio...

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