cases sch with
| nil => contradiction
| cons s ss => simp [hasNameOfFromCHeaders]
η : Type u_η
dec_η : DecidableEq η
schema : Schema
sch : Schema
hdr : Header
hpf : HasCol hdr sch
cs : List (CertifiedHeader sch)
nm : η
h : HasName nm (map Sigma.fst cs)
⊢ hasNameOfFromCHeaders (HasName.tl h) = hasNameOfFromCHeaders h
no goals