mb list 1 Sections MarkB generic Doc
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TheoremName
Thm* l1,l2,l3:T List. l1  l2  l1  l2 @ l3[iseg_append]
cites the following:
Thm* as,bs,cs:T List. ((as @ bs) @ cs) = (as @ (bs @ cs))[append_assoc]
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
mb list 1 Sections MarkB generic Doc