Def b == if b True else False fi

is mentioned by

Thm* L:T List. L  nil  null(L)	[iseg_nil]
Thm* P:(T), l:T List. filter(P;l)  {x:T| P(x) } List	[filter_type]
Thm* P:(T), L:T List, x:T. (x  filter(P;L))  (x  L) & P(x)	[member_filter]
Thm* L1,L2:T List. null(L2)  L1  tl(L2)  L1  L2	[sublist_tl]
Thm* L:T List, x:T. null(L)  last([x / L]) = last(L)	[last_cons]
Thm* T:Type, L:T List. null(L)  last(L)  T	[last_wf]
Thm* L:T List, x:T. (x  L)  null(L)	[member_null]
Thm* L:T List, x:T. null(L)  (x  L)	[null_member]
Def A List == {l:(A List)| (0<||l||) }	[listp]

In prior sections: bool 1 list 1 mb nat rel 1

Try larger context: MarkB generic IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html