Def P == InjCase(lem(P) ; true; false)

is mentioned by

Def res_exists == P:'a. Q:'a. res_exists('a;x.(P(x));x.(Q(x)))	[hres_exists]
Def res_forall == P:'a. Q:'a. res_all('a;x.(P(x));x.(Q(x)))	[hres_forall]

In prior sections: hol hol bool

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