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.
AB 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, AB=A means that A and B are disjoint, or B is empty.
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