S.1 #1. Here are some intersecting sets. Figure out what should go in the intersection. Give a description of the sorts of things that would go in the intersection, and an example of an element that would be in the intersection.
S.1 # 2. Here is an element that I would like to have be in the intersection of two larger sets. Figure out what the larger sets could be. Write good set definitions for the two larger sets :
This assignment on naming and finding intersections in sets
The Yekkti's assignment