Notes for Math 161: Modern Geometry at UC Irvine (https://www.math.uci.edu/~ndonalds/math161/math161.html)
Some of the content was inspired by what used to be the course text and is now out of print: Modern Geometry by Michael Hvidsten, McGraw-Hill (2012). The approach to Euclidean Geometry via consideration of how Hilbert `fixed' it was inspired by a massive set of detailed notes: Several Topics from Geometry by Franz Rothe (2017).
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