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Mathematics LibreTexts

10: Some Prerequisite Topics

  • Page ID
    14565
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    The topics presented in this section are important concepts in mathematics and therefore should be examined.

    • 10.1: Sets and Set Notation
      A set is a collection of things called elements. For example {1,2,3,8} would be a set consisting of the elements 1,2,3, and 8. To indicate that 3 is an element of {1,2,3,8}, it is customary to write 3∈{1,2,3,8}. We can also indicate when an element is not in a set, by writing 9∉{1,2,3,8} which says that 9 is not an element of {1,2,3,8}. Sometimes a rule specifies a set.
    • 10.2: Well Ordering and Induction