3 ms·

Not if you aim to pass your exam.

• FabHK 3y ago
  Sure they are. You can define a one-to-one mapping, they're equal.
  • orbital223 3y ago
    You can define a one-to-one mapping between the sets {1 2} and {3 4}, but I don't think anyone would say they are equal.
  • srcreigh 3y ago
    You’re thinking of isomorphic, not equal.
    • chowells 3y ago
      They meant "their cardinalities are equal". It's honestly an easy mistake to make, especially if typing on a small screen. Or especially if having a discussion where sizes of infinity are already being discussed.
      • FabHK 3y ago
        equal in cardinality, yes, thanks.