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understanding Complement

• To: mathgroup at smc.vnet.net
• Subject: [mg47927] understanding Complement
• From: Edo <edwardoJE at aking.com>
• Date: Fri, 30 Apr 2004 19:27:07 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hello
love this mathematica, enjoying learning it, here is another Q I have. 
thanks
as I learn by reading other people codes. I came accorse this
Complement[Ceiling[list/delta],{}]
I would like to understand what this {} do?

thanks alot