Passing a list as seperate parameters?

*To*: mathgroup at smc.vnet.net*Subject*: [mg73194] Passing a list as seperate parameters?*From*: "Azumanga" <4zumanga at gmail.com>*Date*: Wed, 7 Feb 2007 05:06:07 -0500 (EST)

I have a recuring problem in using mathematica, which I'm sure there must be a simple fix for, but I've looked through the manual and can't find it. As an example, I build up the list { {a,b},{c,d} }, and I want to find the union of it's elements. At first glance, I want Union. However, Union wants it's input as Union[{a,b},{c,d}], Union[{{a,b},{c,d}}] doesn't do anything. In general I get around this by fold, but it seems there should be a simpler method?

**Follow-Ups**:**Re: Passing a list as seperate parameters?***From:*gardyloo <gardyloo@mail.wsu.edu>

**Re: Passing a list as seperate parameters?***From:*János <janos.lobb@yale.edu>

**Re: Passing a list as seperate parameters?***From:*Sseziwa Mukasa <mukasa@jeol.com>