Def if b t else f fi == InjCase(b ; t; f)

is mentioned by

Def FIncr == {f | i:  if i=0  else {f(i-1)...} fi}

[fincr]

In prior sections: bool 1

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