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Where to learn mathematical formulas?

I don't have a background in maths or data science and I've been reading Perry Kauffman's Trading Systems and Methods and there are a lot of mathematical notation/formulas in the book which I would like to understand. Can someone point me in the direction of a good resource where I can learn about this please? There is a lot out there and I'm not sure where to start.
Many thanks!

I guess, this website will be useful for you https://www.matematica.pt/en/useful/mathformulas.php.

Ah that looks like a good place to start thanks!