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I wished I could read / remember the math notations to understand it... anyone else in my case?

Ghrist's youtube channel might be a good place to start: https://www.youtube.com/channel/UC5N5pRddyicAX1QJyJjIIdg

Clicking this video I am fairly certain I’ve read a handwritten book by Ghrist on Applied Algebraic Topology and Sensor Networks. It’s short and fun

At the bottom of the original link.