Def  == Unit+Unit

is mentioned

In prior sections: bool 1 hol hol bool hol sum list 1 hol num hol arithmetic 1 hol list 1 hol list 2 hol arithmetic 4 hol min hol pair hol restr binder

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html