Respuesta :

sqdancefan

Answer:

  no

Step-by-step explanation:

The set of perfect squares includes {0, 1, 4, 9, 16, 25, ...}.

Subtracting a couple of the elements, we get ...

  4 - 1 = 3 . . . . not a member of the set

The set is NOT CLOSED under subtraction.

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