[teleforce]

Really wished modern mathematics textbook cover geometric algebra not only complex algebra, what a shame and a lost of great opportunity [1]. It seems the contents of pure math textbooks do not changed and improved much after more than a century and when I did my pure math A level many years ago the contents are not much different than Hardy's textbook contents.

Apparently and ironically when the textbook was written when Hardy was the Savilian Chair of Geometry at Oxford University. If he had introduced GA into the contents back then it will be a game changing and I'd probably had studied GA in my pure math class back then.

[1] Projective Geometric Algebra:

https://projectivegeometricalgebra.org/