elim (cpy_inv_atom1 … H) -H
[ #H destruct //
| * #J #K #V #i #Hl2i #Hilm2 #HLK #HVT2 #H destruct
- lapply (ylt_yle_trans … (l+m) … Hilm2) /2 width=5 by cpy_subst, monotonic_yle_plus_dx/
+ lapply (ylt_yle_trans … (l+m) … Hilm2)
+ /2 width=5 by cpy_subst, monotonic_yle_plus_sn/
]
| #I #G #L #K #V #V2 #i #l #m #Hli #Hilm #HLK #HVW #T2 #HVT2 #Hm
lapply (cpy_weak … HVT2 0 (i+1) ? ?) -HVT2 /3 width=1 by yle_plus_dx2_trans, yle_succ/