theorem
  i in dom p & p+*(i,m+1) in dom primrec(f1,f2,i) implies
  primrec(f1,f2,i).(p+*(i,m+1)) =
   f2.((p+*(i,m))^<*primrec(f1,f2,i).(p+*(i,m))*>) by Lm6;
