C routines: fonctions complexes probabilités matrices minimax-polynomes ...
This book helps the student complete the transition from purely manipulative to rigorous mathematics. The clear exposition covers many topics that are assumed by later courses but are often not covered with any depth or organization ...
The Zakon Series on Mathematical Analysis by Elias Zakon:
Basic Concepts of Mathematics, Mathematical Analysis I (in preparation), Mathematical Analysis II (in preparation)
Donald E. Knuth
On-line Edition, by H. Jerome Keisler
This is a calculus textbook at the college Freshman level based on Abraham Robinson's infinitesimals, which date from 1960.