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Up N' Down values.
Hi there, I'm having some hard time trying to define "up values" to subscripted variables, what I would like to do is (Latex notations) d_1 /: Equal[d_1,0]:=False Ok, I know that the full form of d_1 is Subscript[d,1] so I've tried; Subscript /: Equal[Subscript[d,1],0]:=Flase and d /: Equal[Subscript[d,1],0]:=Flase but none seems to work, I get the error message: TagSetDelayed::"tagnf": "Tag d not found in False==0. which I don't understand. Any idea? Regards. \/\\/\/\/>> Gadi ORON <<\/\/\/\/ EMAIL : oron at pmmh.espci.fr Homepage : http://www.pmmh.espci.fr/~oron/personal.html ICQ#7316619