Day 128 and 129 – March 17, 18

Algebra 1a: Chapter 9, Lesson 1, page 400.

Sets, Intersections and Unions

A set is a well-defined collection of objects called members or elements.

  • Roster notation LISTS the members of the set.
  • Set-Builder Notation gives a DESCRIPTION of how the set is built.

The intersection of 2 sets `A` and `B`, written `A ∩ B` is the set of all members that are COMMON to both sets. We say ” A intersection B”.

The union of 2 sets `A` and `B`, written `A ∪ B` is the set of all members that are in `A` or `B` or in both. If an intersection is EMPTY, we say the intersection is the empty set which is symbolized as `∅`.

All of these concepts are described here too with examples!

Two of tonight’s homework problems solved by MrE are here! Just click it!

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