The geometry of mathematical methods (books.physics.oregonstate.edu)

Why "Geometry"? Seems to just be a math 101.

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It'd be nice to incorporate links to Demos-3D to supplement visualizations of complex number algebra and 3D vector/matrix ops: https://www.youtube.com/playlist?list=PLfM6zMGnbgOHoJFFgqQ4O...

I always thought the notation of differentials is a footgun:

https://books.physics.oregonstate.edu/GMM/notdiff.html