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6 months ago
  1. \item \self Assume you are given the formulas $a$ and
  2. $b$, which symbolically represent the sets $A$ and $B$,
  3. respectively. What would you have to check on $a, b$ to test
  4. whether or not $A$ is a strict subset of $B$, i.e., $A \subset
  5. B$?