# when expressing domain,

what does the parentheses & brackets mean? for example, [0, infinity)

The bracket, '[' means the left endpoint is included in the interval and the parentheses, ')' means the right enpoint is not part of the interval. The interval here, [0,infinity), is the set of non-negative reals.

1. 👍
2. 👎
3. 👁
4. ℹ️
5. 🚩