Write in symbolic form what the following means.

1. A subset (every element of one set is an element of the other).

2. An element of (AxB)U(CxD)

3. An element of (AUC) x (BUD).

The result should be a proposition consisting of logical connectives and things like or . Is this proposition true?

You will not be able to solve this problem until you know the definitions of a subset, a Cartesian product and a union and are able apply those definitions to this situation.