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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.

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11y ago

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