Posted by **Fakaapo. Suetusi** on Thursday, March 29, 2012 at 5:30am.

What can you say about sets A and B if you know that.

1)A U B = A?

2)A ¿ B = A?

3)A - B = A?

- math -
**Reiny**, Thursday, March 29, 2012 at 8:29am
1. A ⊇ B , B is a subset of A

2. not familiar with the operator ¿ in sets

3. Did not know that "-" was an operator with sets

- math -
**Steve**, Thursday, March 29, 2012 at 11:47am
I assume 2) is intersection

If the intersection of A and B = A, then A is a subset of B.

A-B is the members of A that are not in B. If that is equal to A, then B is empty.

- math - PS -
**Steve**, Thursday, March 29, 2012 at 11:50am
Hmmm. On that last one, A-B=A means that A and B are disjoint, or B is empty.

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