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4 (* ||A|| A project by Andrea Asperti *)
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15 include "basic_2/computation/xprs_lsubss.ma".
16 include "basic_2/dynamic/lsubsv.ma".
18 (* LOCAL ENVIRONMENT REFINEMENT FOR STRATIFIED NATIVE VALIDITY **************)
20 (* Properties on stratified native type assignment **************************)
22 axiom lsubsv_ssta_trans: ∀h,g,L2,T,U2,l. ⦃h, L2⦄ ⊢ T •[g,l] U2 →
23 ∀L1. h ⊢ L1 ⊩:⊑[g] L2 →
24 ∃∃U1. L1 ⊢ U2 ⬌* U1 & ⦃h, L1⦄ ⊢ T •[g,l] U1.