Def  == Unit+Unit

is mentioned by

Def select == p:'a. @x:'a. (p(x))	[hselect]
Def implies == p:. q:. pq	[himplies]
Def hbool ==	[hbool]

In prior sections: bool 1 hol

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