Def x=yAtom == if x=yAtomtrue; false fi

is mentioned by

Thm* x,y:Atom. (x=yAtom ~ false)  x = y	[eq_atom_eq_false_elim_sqequal]
Thm* x,y:Atom. (x=yAtom ~ true)  x = y	[eq_atom_eq_true_elim_sqequal]
Thm* x,y:Atom. x=yAtom = false  x = y	[eq_atom_eq_false_elim]
Thm* x,y:Atom. x=yAtom = true  x = y	[eq_atom_eq_true_elim]

In prior sections: bool 1

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