1. The problem is to express a given set or solution in interval notation. 2. Interval notation is a way of writing subsets of the real number line using intervals. 3. Common interval types include: - Closed interval: $[a,b]$ means all numbers from $a$ to $b$ including $a$ and $b$. - Open interval: $(a,b)$ means all numbers between $a$ and $b$ but not including $a$ and $b$. - Half-open intervals: $[a,b)$ or $(a,b]$ include one endpoint but not the other. 4. To convert a set or inequality to interval notation, identify the lower and upper bounds and whether they are included. 5. Since no specific set or inequality was provided, please provide the set or inequality to convert into interval notation.