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15 include "basic_2/unwind/sstas_lift.ma".
16 include "basic_2/dynamic/snv.ma".
18 (* STRATIFIED NATIVE VALIDITY FOR TERMS *************************************)
20 (* Forward_lemmas on iterated stratified static type assignment for terms ***)
22 lemma snv_sstas_fwd_correct: ∀h,g,L,T1,T2. ⦃h, L⦄ ⊢ T1 ¡[g] → ⦃h, L⦄ ⊢ T1 •* [g] T2 →
23 ∃∃U2,l. ⦃h, L⦄ ⊢ T2 •[g] ⦃l, U2⦄.
24 #h #g #L #T1 #T2 #HT1 #HT12
25 elim (snv_fwd_ssta … HT1) -HT1 /2 width=5 by sstas_fwd_correct/