[itex]X = [0, 1] \bigcup (2,3)[/itex] is phase space.(adsbygoogle = window.adsbygoogle || []).push({});

Show that [itex](2, 3) [/itex] open and closed set of [itex] X [/itex] .

the question is like that but I think it is false because it is not close, right?

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# Phase space, open closed set

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