# 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 | ∉ |