lemma csn_fwd_flat_dx: ∀I,L,V,T. L ⊢ ⬇* ⓕ{I} V. T → L ⊢ ⬇* T.
/2 width=5/ qed-.
-(* Basic_1: removed theorems 7:
- sn3_gen_cflat sn3_cflat sn3_appl_cast sn3_appl_beta
+(* Basic_1: removed theorems 9:
+ sn3_gen_cflat sn3_cflat
+ sn3_appl_cast sn3_appl_beta sn3_appl_lref sn3_appl_abbr
sn3_bind sn3_appl_bind sn3_appls_bind
*)