src/HOL/SMT/Examples/cert/z3_hol_03

misc tuning and clarification;

(benchmark Isabelle
:extrasorts ( T1 T2)
:extrafuns (
  (uf_3 T2)
  (uf_1 T1 T1)
  (uf_2 T2 T2)
  (uf_4 T1)
 )
:assumption (forall (?x1 T1) (= (uf_1 ?x1) ?x1))
:assumption (forall (?x2 T2) (iff (= (uf_2 ?x2) uf_3) (= ?x2 uf_3)))
:assumption (not (and (= (uf_1 uf_4) uf_4) (iff (= (uf_2 uf_3) uf_3) true)))
:formula true
)