Appendix A


A.1 Sets

A set is a Many that allows itself to be thought of as a One.

– Georg Cantor

Amazon should put their cloud in a cloud, so the cloud will have the redundancy of the cloud.

– @dowens

A set is a collection of objects. The objects can be anything: numbers, people, cats, courses, even other sets! The language of sets allows us to talk precisely about events. If S is a set, then the notation xS indicates that x is an element or member of the set S (and xS indicates that x is not in S). We can think of the set as a club, with precisely defined criteria for membership. For example:

  1. {1, 3, 5, 7,...} is the set of all odd numbers;
  2. {Worf, Jack, Tobey} is the set of Joe’s cats;
  3. [3, 7] is the closed interval consisting of all ...

Get Introduction to Probability now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.