How did people figure out math symbols?

Ask a Mathematician
Written By Nick Rauh
Nick Rauh

Nick is a Seattle-based mathematician who has spent his career teaching at colleges and designing math activities for K-12 children. He is currently the Mathematician in Residence at the Seattle Universal Math Museum.

https://maththem.blogspot.com
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I wonder what the first 100,000,000 digits of pi are.
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I wonder how the Gavin Theobald equation works with concave polygons.