I'm open and not closed
or closed but not open.
If I'm not, though I can be,
open and closed
or neither closed nor open.
Hint: math
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5$\begingroup$ I'm voting to close... or open... ARGH, I'M SO CONFUSED! ;-) $\endgroup$ – Stiv Nov 22 '19 at 22:39
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$\begingroup$ Hopefully the answer is not related to body part of seniors.. $\endgroup$ – Alex Nov 22 '19 at 23:11
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$\begingroup$ @Alex rot13(vg vf abg) :) $\endgroup$ – jazhang Nov 23 '19 at 1:14
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Sets? Because they can be open, closed, both or neither open or closed?
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Are you a(n)
interval?
I'm open and not closed
If an interval does not contain its endpoints it is open.
or closed but not open.
A closed interval does contain its endpoints.
If I'm not, though I can be,
open and closed
A half-open interval contains only one of its endpoints.
or neither closed nor open.
A degenerate interval only consists of one real number.
Hint:
An interval in math is a set of (real) numbers lying between the extremities.
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$\begingroup$ hmm, this wasn't my original intention. The 'thing' could be both open and closed or neither closed nor open. I've edited the puzzle to reflect this clarification $\endgroup$ – jazhang Nov 23 '19 at 1:10
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