Definitions list 1 Sections StandardLIB Doc
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Some definitions of interest.
geDef ij == ji
Thm* i,j:. (ij Prop
lengthDef ||as|| == Case of as; nil  0 ; a.as'  ||as'||+1  (recursive)
Thm* A:Type, l:A List. ||l||  
Thm* ||nil||  

About:
listnillist_indintnatural_number
addrecursive_def_noticeuniversememberpropall!abstraction
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions list 1 Sections StandardLIB Doc