INDUCTIVE DEFINITION leq () [ :G ]
OF ARITY AAProp
BUILT FROM:
     leq_sort: h1:nat
                       .h2:nat
                         .n1:nat
                           .n2:nat
                             .k:nat
                               .eq A (aplus g (ASort h1 n1) k) (aplus g (ASort h2 n2) k)
                                 leq g (ASort h1 n1) (ASort h2 n2)
   | leq_head: a1:A.a2:A.(leq g a1 a2)a3:A.a4:A.(leq g a3 a4)(leq g (AHead a1 a3) (AHead a2 a4))