Mastodawn

Chapter 1 of "Asymptotic Methods in Statistics" by De Bruijn gives a nice exposition of the Landau big-Oh and little-oh notation:

http://store.doverpublications.com/0486642216.html

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Asymptotic Methods in Analysis

This pioneering study/textbook in a crucial area of pure and applied mathematics features worked examples instead of the formulation of general theorems. Extensive coverage of saddle-point method, iteration, and more. 1958 edition.