I learned analytic number theory from his text book. Probably unlike most other HN participants, that is where I learned big-oh notation, in its original contex

I learned analytic number theory from his text book. Probably unlike most other HN participants, that is where I learned big-oh notation, in its original context: measuring the growth of arithmetic functions. I distilled what I learned into a short little undergrad paper: http://jordi.platinum.linux.pl/dirichlet-primes.pdf http://jordi.platinum.linux.pl/dirichlet-primes.pdf Thank you, Tom Apostol, for writing a book on analytic number theory for me to learn from.