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4 (* ||A|| A project by Andrea Asperti *)
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7 (* ||T|| The HELM team. *)
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15 include "basic_2/static/da_sta.ma".
16 include "basic_2/static/sta_aaa.ma".
18 (* DEGREE ASSIGNMENT FOR TERMS **********************************************)
20 (* Properties on atomic arity assignment for terms **************************)
22 lemma aaa_da: ∀h,g,G,L,T,A. ⦃G, L⦄ ⊢ T ⁝ A → ∃l. ⦃G, L⦄ ⊢ T ▪[h, g] l.
23 #h #g #G #L #T #A #H elim (aaa_sta h … H) -A /2 width=2 by sta_da/