[Solution] Prove or disprove the following statements. Let A be a set. If A ∩ B=φ for every set B, then A=φ. Let A be a set. If A-B=φ for


Question: Prove or disprove the following statements.

  1. Let \(A\) be a set. If \(A \cap B=\phi\) for every set \(B\), then \(A=\phi\).
  2. Let \(A\) be a set. If \(A-B=\phi\) for every set \(B\), then \(A=\phi\).

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