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I thought this too -- in fact the contents of this site are about the level of what good 16-year-olds learn in my country. I'd love to read an accessible 'intermediate' introduction to abstract algebra.

Something I've inferred -- and would love to be corrected on -- is that in the US there's a relatively well-defined course implied by the words "calculus" or "algebra". I can guess what they are, but I'm not certain, and it seems to change!

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Before College all math courses in the US 'build up' to Calculus 1 & 2 [1,2] presumably to prepare motivated students for engineering. Calculus 2 is the highest you can go in a public High School before a student will start thinking about starting their college career early or doing an independent study. This one track path is not without its side effects. As you can see by skimming this textbook the information on linear systems is lacking - something that might be more interesting to those who want to study CS.

[1]: https://www.khanacademy.org/math/calculus-1

[2]: https://www.khanacademy.org/math/calculus-2

You’re right. This book contains what US high schoolers learn in “Algebra 2.”

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