Definitions list 1 Sections StandardLIB Doc
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Some definitions of interest.
leDef AB == B<A
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||  
selectDef l[i] == hd(nth_tl(i;l))
Thm* A:Type, l:A List, n:. 0n  n<||l||  l[n A

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

Definitions list 1 Sections StandardLIB Doc