Question 426110
<pre>
A={Ron,Lisa}

The subsets of A are

1. { }
2. {Ron}
3. {Lisa}
4. {Ron,Lisa}

The first one is the empty set, which is also written &#8709;.
The last one is the set A itself, which is considered to
be a subset, but is not called a PROPER subset.

Edwin</pre>