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

my2cents
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    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"? – David K Sep 06 '20 at 00:45
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    $x\in{3,10}$ means $x=3$ or $x=10$; $x\in(3,10)$ means $3\lt x\lt10$ – J. W. Tanner Sep 06 '20 at 01:10
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    Your question is unclear to me. How are you "combining" set notation and interval notation? – Xander Henderson Sep 06 '20 at 14:19

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