Beginning Activity Beginning Activity 2: An Indexed Family of Sets
We often use subscripts to identify sets. For example, in Beginning Activity 1, instead of using
So if we have a family of sets
1.
Determine
We can see that with the use of subscripts, we do not even have to define the family of sets
and use the subscripts to indicate which sets to use in a union or an intersection.
2.
Use the roster method to specify each of the following pairs of sets. The universal set is