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math

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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 -

    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 -

    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 -

    Hmmm. On that last one, A-B=A means that A and B are disjoint, or B is empty.

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