Definitions list 1 Sections StandardLIB Doc
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Some definitions of interest.
selectDef l[i] == hd(nth_tl(i;l))
Thm* A:Type, l:A List, n:. 0n  n<||l||  l[n A
hdDef hd(l) == Case of l; nil  "?" ; h.t  h
Thm* A:Type, l:A List. ||l|| hd(l A
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||  
nth_tlDef nth_tl(n;as) == if n0 as else nth_tl(n-1;tl(as)) fi  (recursive)
Thm* A:Type, as:A List, i:. nth_tl(i;as A List

About:
listnillist_ind
ifthenelseintnatural_numberaddsubtractless_thantoken
recursive_def_noticeuniversememberpropimpliesall
!abstraction
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions list 1 Sections StandardLIB Doc