Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

On Defining Functions Symmetric wrt Some Indices

• To: mathgroup at smc.vnet.net
• Subject: [mg34316] On Defining Functions Symmetric wrt Some Indices
• From: Alexei Akolzin <akolzine at uiuc.edu>
• Date: Tue, 14 May 2002 04:12:42 -0400 (EDT)
• Organization: University of Illinois at Urbana-Champaign
• Sender: owner-wri-mathgroup at wolfram.com

Hello,

For the purposes of formula simplification I need to specify that some
function "f" is symmetric upon SOME of its indices. For example,
f[a,b,c] == f[a,c,b] but NOT equal to f[b,a,c]. 

The proposed command SetAttribute[f,Orderless] makes the function
symmetric wrt ALL of its indices, which I want to avoid.

Is there is a way to neatly solve this problem?

Thanks.

Alexei.