[Maxima] Empty Set Symbol

[Leo Butler]

On Sun, 29 Nov 2009, Tiscali wrote:

< I'm working in the sets theory... What i have to do if I want everytime there is a {} (empty set) in a result maxima shows a symbol (or a letter)? Example:
< 
< {{},{{}}}
< 
< I want maxima showing this:
< 
< {ES,{ES}}
< 
< (ES for Empty Set...but it's okay anyway..)
 
Try:

(%i2) tellsimpafter({},ES);

(%o2) [setrule2,?simp\-set]
(%i3) {};

(%o3) ES
(%i4) {{},{{}}};

(%o4) {ES,{ES}}

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