Set notation page 2
Here are a couple of tricky
ones:
|
A |
|
People who like apples |
This is tricky, but it's not
complicated .
The point is that you shade the same places and include the same elements
whether you put B in the picture or not, so you don’t need B in either
the set notation or the description in words
same thing in the next one
|
B |
|
People who like bananas. |
|
or
|
|
People who like neither
apples nor bananas or People who don’t
like apples and don’t like bananas |
The first notation: 
, where
the bar is over the whole thing, says, figure out the union set:
And then take its complement;
The
notation is like an automatic
parentheses, so if a long piece has a bar over it, you do that whole thing
first, and then take the complement.
The second notation: 
says
take the complement of each A and B;
and then look at where those
sets overlap (intersect):
