Goal:
    G : t  x : V.t  y : V.t
  ============================
   (lsp00 (VSet.cardinal (V G)) (V G) x y =
    lsp00 (VSet.cardinal (V G)) (V G) x y)


DEBUG:Going to execute:
let rec do_ccl :=
            try do_atom; repeat (do_intro; try do_atom); try arith_congr;
             (solve [ split; do_ccl ])
           in
           (solve [ do_atom | use_hyps; do_ccl ]) ||
             fail "Cannot solve this goal"