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Is it possible for us to combine set notation and interval notation, e. g. $x \in \{3, 10\}$?

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    $\begingroup$ What you've written looks like standard set notation to me. And since intervals are sets, "interval notation" arguably is just a specialized type of set notation. Which part of your example did you think was "interval notation"? $\endgroup$
    – David K
    Sep 6, 2020 at 0:45
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    $\begingroup$ $x\in\{3,10\}$ means $x=3$ or $x=10$; $x\in(3,10)$ means $3\lt x\lt10$ $\endgroup$
    – J. W. Tanner
    Sep 6, 2020 at 1:10
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    $\begingroup$ Your question is unclear to me. How are you "combining" set notation and interval notation? $\endgroup$
    – Xander Henderson ♦
    Sep 6, 2020 at 14:19

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