| * #J #K #W #j #Hdj #Hji #HLK #HnW
elim (yle_inv_succ1 … Hdj) -Hdj #Hdj #Hj
lapply (ylt_O … Hj) -Hj #Hj
- lapply (ldrop_inv_drop1_lt … HLK ?) // -HLK #HLK
+ lapply (drop_inv_drop1_lt … HLK ?) // -HLK #HLK
>(plus_minus_m_m j 1) in ⊢ (%→?); [2: /3 width=3 by yle_trans, yle_inv_inj/ ]
#HnU1 <minus_le_minus_minus_comm in HnW;
/5 width=9 by nlift_bind_dx, monotonic_lt_pred, lt_plus_to_minus_r, ex5_4_intro, or_intror/