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What is the precise definition of, "Differs in exactly one element"?

  1. Sep 11, 2014 #1
    Do {1,2,3} and {1,2} differ in, or by exactly one element? Or do those two things mean the same thing. Also, what about {1,2,3} and {1,2,4}.
     
  2. jcsd
  3. Sep 12, 2014 #2
    If you want to be precise use symbols instead of words, but in normal usage:
    {1,2,3} and {1,2} differ by exactly one element
    {1,2,3} and {1,2,4} differ in exactly one element
     
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