When to Use U in Interval Notation?
Using Interval Notation If an Endpoint Is Included, Then Use [ or ]. .. . for Infinite Intervals, Use Inf for ∞ (Infinity) and/or -Inf for -∞ (-Infinity)...
- If an endpoint is included, then use [ or ]. ...
- For infinite intervals, use Inf for ∞ (infinity) and/or -Inf for -∞ (-Infinity). ...
- If the set includes more than one interval, they are joined using the union symbol U.
What does the U in interval notation mean?
On the number line it looks like this: And interval notation looks like this: (-∞, 2] U (3, +∞) We used a "U" to mean Union (the joining together of two sets).
How do you use U in interval notation?
using interval notation as, (−∞, 0) ∪ (0, ∞). We use the union symbol (∪) between these two intervals because we are removing the point x = 0. Notice that on our number line, an open dot indicates exclusion of a point, a closed dot indicates inclusion of a point, and an arrow indicates extension to −∞ or ∞.
Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.
