Definition 14.8.2 (h-interval). A h-interval is an interval of the form $(a, b] \subset \real$ where $-\infty < a \le b < \infty$.
Definition 14.8.2 (h-interval). A h-interval is an interval of the form $(a, b] \subset \real$ where $-\infty < a \le b < \infty$.