lemma csn_fwd_flat_dx: ∀I,L,V,T. L ⊢ ⬇* ⓕ{I} V. T → L ⊢ ⬇* T.
/2 width=5/ qed-.
-(* Basic_1: removed theorems 9:
- sn3_gen_cflat sn3_cflat
+(* Basic_1: removed theorems 14:
+ sn3_cdelta
+ sn3_gen_cflat sn3_cflat sn3_cpr3_trans sn3_shift sn3_change
sn3_appl_cast sn3_appl_beta sn3_appl_lref sn3_appl_abbr
- sn3_bind sn3_appl_bind sn3_appls_bind
+ sn3_appl_appls sn3_bind sn3_appl_bind sn3_appls_bind
*)