Def Unit == 0  

is mentioned by

Thm* 'a:S, e:'a. Thm* (fn:(Unit'a). fn() = e) Thm* & (fn,y:(Unit'a). fn() = e & y() = e  fn = y)	[one_axiom_2]
Thm* v:Unit. v =	[one_wd]
Thm* 'a:S, f,g:('aUnit). f = g	[one_axiom]
Def hone == Unit	[hone]

In prior sections: core bool 1

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