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MathGroup Archive 2004

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Re: Re: how to delete duplicate items in the same list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45594] Re: [mg45576] Re: how to delete duplicate items in the same list
  • From: Selwyn Hollis <sh2.7183 at misspelled.erthlink.net>
  • Date: Fri, 16 Jan 2004 06:05:09 -0500 (EST)
  • References: <bto1uf$2ka$1@smc.vnet.net> <bu0cjl$ah9$1@smc.vnet.net> <200401140626.BAA19761@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Union applied to a single list essentially "converts" the list to a 
set, thus removing duplicate elements?

-----
Selwyn Hollis
http://www.math.armstrong.edu/faculty/hollis
(edit reply-to to reply)

On Jan 14, 2004, at 1:26 AM, AES/newspost wrote:

>>> I can't find a way to make sure all items in the same list are 
>>> unique. Can
>>> anybody help me out? Thanks a lot!
>
>> Union[a]==a
>
>
> Can anyone explain why "Union" means what it does?  -- or at least a
> mental crutch to help me remember that Union is the command that does
> this?
>
> (Doesn't seem an obvious name for the function involved, though I
> suppose I could try to think "Unique" --->  "Union")
>


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