Good reads
This is a collection of math-related books and articles that I enjoyed reading. I do not recommend text books on algebra or group theory, since in these cases I prefer my own lectures notes.
Books
O. Forster, Analysis 1, 12. Auflage, Springer Spektrum, 2016 (most concise German text)
K. Fritzsche, Grundkurs Funktionentheorie, 2. Auflage, Springer Spektrum 2019 (very linear reading, despite some typos)
A. Leutbecher, Zahlentheorie, Springer, 1996 (extremely carefully written, serious use of traditional German language)
G. Navarro, Characters and blocks of finite groups, CUP, 1998 (down to earth approach, best intro to Brauer's theory)
T. Petsinis, The french mathematician, Walker & Co, 1998 (a novel based on Galois' life)
K. Ono, A. D. Aczel, My Search for Ramanujan, Springer, 2016 (Ono compares his emigrant life to Ramanujan's)
S. G. Krantz, Mathematical Apocrypha (redux), AMS, 2002 (2006) (faithful mathematical anecdotes)
P. R. Halmos, I want to be a mathematician, Springer, 1985 (confidential details of the AMS in the last century, sometimes a bit long-winded)
Articles
P. R. Halmos, How to write mathematics, l’Enseignement Mathématique 16 (1970), 123–152, https://sites.math.washington.edu/~lind/Resources/Halmos.pdf
P. R. Halmos, How to talk mathematics, Notices of the AMS (1974) 21, 155–158, https://faculty.washington.edu/heagerty/Courses/b572/public/HalmosHowToTalk.pdf
P. G. Casazza, A mathematician's survival guide, lsa.umich.edu/psych/junz/Publication/Peter%20Casazza.pdf
W. P. Thurston, On proof and progress in mathematics, Bull. AMS 30 (1994), 161–177, http://www.ams.org/journals/bull/1994-30-02/S0273-0979-1994-00502-6/S0273-0979-1994-00502-6.pdf
G.-C. Rota, Ten lessons I wish I had been taught, Notices Amer. Math. Soc. 44 (1997), 22–25, www.ams.org/notices/199701/comm-rota.pdf
D. E. Knuth, Two notes on notation, Amer. Math. Monthly 99 (1992), 403-422, https://www.jstor.org/stable/pdf/2325085.pdf
J.-P. Serre, How to write mathematics badly, talk, https://www.youtube.com/watch?v=ECQyFzzBHlo