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Huh. When I took Calculus II in community college, the professor introduced sum notation and like 2/3 of the class was like “wow that’s cool I didn’t know about that”. I don’t remember ever being formally taught it before that but it still surprises be how few people where already familiar with it.
To be fair, that post specifically asks people who don’t have a technical background. It can be used to show that laymen have the capacity to use a federated platform like lemmy, but not that they are a significant portion of the userbase (albeit that post does have a lot of replies).