# Set and Interval Notation

The following set and interval notation can be entered in Show My Work boxes.

Note: In addition to the keyboard shortcuts listed in this topic, some symbols can be
typed using the keyboard shortcuts for your operating system; for example, you can
press ALT+0247 on Windows to type
÷.

Notation | Keyboard | Button | Notes |
---|---|---|---|

Set delimiters (braces) | {a,b | A closing brace is automatically inserted. | |

Closed interval (brackets) | [a,b | A closing bracket is automatically inserted. | |

Open interval (parentheses) | (a,b | A closing parenthesis is automatically inserted. | |

Empty set | ∅ | ||

Union | ∪ | ||

Intersection | ∩ | ||

Subset | ⊂ | ||

Superset | ⊃ | ||

Element of | ∈ | ||

Not an element of | ∉ |