# 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 | ∉ |