Either. Whether a particular number is open or closed depends on the set in question, not the specific number.
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"Show" is open, "and" is closed. O- is open, -pen is closed. "Closed" is closed.
There are four types of line segments: open, closed and semi open (or semi-closed).With an open line segment, neither end-point is included. In terms of inequalities, it would be of the form a < x < b.Closed segment: both end-points are included so that a ≤ x ≤ b.Semi-open, one end-point is included, the other is not.
If the value at the end is not included (< or >) then it should be an open circle. If the value at the end isincluded (≤ or ≥) then it should be a closed circle.
Both open syllables.
Both closed.