"mathematics is not a spectators sport"
https://mathigon.org/courses#i
Step by step lessons for high school and college topics:"Mathematics is an essential part of our culture, just like Mozart and Shakespeare – it enables science and innovation, and describes profound truths about our universe.
Yet, the real power of mathematics is not what you lean, but how you learn: logical thinking, problem solving, reasoning and proof. It is often said that "mathematics is not a spectators sport" – you have to actively do mathematics to really understand what it is about.
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