Chapter notes

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## Chapter notes

Knuth [182] traces the origin of the O-notation to a number-theory text by P. Bachmann in 1892. The o-notation was invented by E. Landau in 1909 for his discussion of the distribution of prime numbers. The Ω and Θ notations were advocated by Knuth [186] to correct the popular, but technically sloppy, practice in the literature of using O-notation for both upper and lower bounds. Many people continue to use the O-notation where the Θ-notation is more technically precise. Further discussion of the history and development of asymptotic notations can be found in Knuth [182, 186] and Brassard and Bratley [46].

Not all authors define the asymptotic notations in the same way, although the various definitions agree in most common situations. Some of the alternative definitions encompass functions that are not asymptotically nonnegative, as long as their absolute values are appropriately bounded.

Equation (3.19) is due to Robbins [260]. Other properties of elementary mathematical functions can be found in any good mathematical reference, such as Abramowitz and Stegun [1] or Zwillinger [320], or in a calculus book, such as Apostol [18] or Thomas and Finney [296]. Knuth [182] and Graham, Knuth, and Patashnik [132] contain a wealth of material on discrete mathematics as used in computer science.

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