Def exists == p:'a. x:'a. (p(x))

is mentioned by

Thm* exists(rep:hone  hbool. type_definition((b:hbool. b),rep))

[hone_ty_def]

In prior sections: hol bool

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