Wolfram Language & System 10.3 (2015)|Legacy Documentation
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gives a sorted list of all the distinct elements that appear in any of the .
gives a sorted version of a list, in which all duplicated elements have been dropped.
- If the are considered as sets, Union gives their union.
- Union[list1,list2,…] can be input in StandardForm and InputForm as . The character can be entered as EscunEsc or \[Union].
- The must have the same head, but it need not be List.
- Union[list1,…,SameTest->test] applies test to each pair of elements in the to determine whether they should be considered the same.
Introduced in 1988
(1.0)| Updated in 1996