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I know or at least correct me if I'm wrong two elements are {3,2}. How would I come to find another element?

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    $\begingroup$ What do you mean by S[4] $\endgroup$ – Tojrah May 13 at 2:08
  • $\begingroup$ sorry it should just be [4] $\endgroup$ – Eve M May 13 at 2:16
  • $\begingroup$ What does it mean now? $\endgroup$ – Tojrah May 13 at 2:17
  • $\begingroup$ where a in S is 4: |4-b|<2 or |4-b|=2 $\endgroup$ – Eve M May 13 at 2:20
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    $\begingroup$ The class of $4$, $[4]$, consists of all numbers that are at distance $2$ of smaller from $4$. This is the closed interval $[2,6]$. $\endgroup$ – logarithm May 13 at 2:55

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