-lemma lfxs_inv_lref_sn: â\88\80R,L1,L2,i. L1 ⦻*[R, #i] L2 → ∀I,K1,V1. ⬇*[i] L1 ≡ K1.ⓑ{I}V1 →
- â\88\83â\88\83K2,V2. â¬\87*[i] L2 â\89¡ K2.â\93\91{I}V2 & K1 ⦻*[R, V1] K2 & R K1 V1 V2.
+lemma lfxs_inv_lref_sn: â\88\80R,L1,L2,i. L1 ⪤*[R, #i] L2 → ∀I,K1,V1. ⬇*[i] L1 ≡ K1.ⓑ{I}V1 →
+ â\88\83â\88\83K2,V2. â¬\87*[i] L2 â\89¡ K2.â\93\91{I}V2 & K1 ⪤*[R, V1] K2 & R K1 V1 V2.