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:
solve
[ trivial
with eq_true
| reflexivity
| symmetry; trivial
| contradiction
| congruence ]