I think erich.oliphant wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Hi,
> I am trying to figure out the best way to have a rule fire only for a fact
> whose slot value is the min or max of a group of facts.

Match a negated pattern to the (nonexistent) fact in which some
number is greater than the greatest value.

 (defrule biggest-number
     (number (value ?val))
     (not (number (value ?val2&:(> ?val2 ?val))))

Ernest Friedman-Hill  
Advanced Software Research          Phone: (925) 294-2154
Sandia National Labs                FAX:   (925) 294-2234
PO Box 969, MS 9012                 [EMAIL PROTECTED]
Livermore, CA 94550         http://herzberg.ca.sandia.gov

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