elim (lt_or_eq_or_gt i j) #Hij
[ /3 width=4 by lifts_lref_ge_minus, cpr_refl, ex2_2_intro/
| elim (lifts_total V (𝐔❨↑i❩)) #U2 #HU2
- elim (lifts_split_trans â\80¦ HU2 (ð\9d\90\94â\9d¨iâ\9d©) (ð\9d\90\81❨i,1❩)) [2: @(after_basic_rc i 0) ]
+ elim (lifts_split_trans â\80¦ HU2 (ð\9d\90\94â\9d¨iâ\9d©) (ð\9d\90\9b❨i,1❩)) [2: @(after_basic_rc i 0) ]
/3 width=7 by cpm_delta_drops, ex2_2_intro/
| /3 width=4 by lifts_lref_lt, cpr_refl, ex2_2_intro/
]