Equivalence

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Across
  1. 2. two shapes are the same shape
  2. 4. two numbers are the same
  3. 7. two sets with preserved relationships both ways
  4. 8. two sets with preserved relationships from one to the other
  5. 9. two shapes are the same size and shape
Down
  1. 1. two functions map elements exactly to each other
  2. 3. collection of objects sharing properties
  3. 5. topological spaces are continuously deformed into each other
  4. 6. relationships between points preserved