Wolfram Language & System 11.0 (2016)|Legacy Documentation
gives a sorted list of all the distinct elements that appear in any of the listi.
gives a sorted version of a list, in which all duplicated elements have been dropped.
- If the listi are considered as sets, Union gives their union.
- Union[list1,list2,…] can be input in StandardForm and InputForm as list1⋃list2⋃…. The character ⋃ can be entered as EscunEsc or \[Union].
- The listi must have the same head, but it need not be List.
- Union[list1,…,SameTest->test] applies test to each pair of elements in the listi to determine whether they should be considered the same.
Introduced in 1988
(1.0)| Updated in 1996