simpa[Semiterm.Operator.val, Semiterm.Operator.One.one, val_func, ←Matrix.fun_eq_vec₂] using
  Structure.One.one (L := L) (M := M)
L : Language
M : Type u_1
inst✝³ : Structure L M
inst✝² : L.One
inst✝¹ : One M
inst✝ : Structure.One L M
⊢ func Language.One.one ![] = 1
no goals