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：2025/11/21
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(mathematics) A half space that does not include the plane that bounds it
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open half space
Every point in the open half space satisfies the inequality x + y + z > 0, so the plane x + y + z = 0 is excluded.
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Every point in the open half space satisfies the inequality x + y + z > 0, so the plane x + y + z = 0 is excluded.
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