have hchar' : (ringChar K : K) = 2 := by simp [h]
K : Type u
inst✝¹ : CommRing K
inst✝ : IsDomain K
e : Model K
h : ringChar K = 2
hdisc : discr e = 0
ha1 : e.a1 = 0
⊢ e.a3 = 0
K : Type u
inst✝¹ : CommRing K
inst✝ : IsDomain K
e : Model K
h : ringChar K = 2
hdisc : discr e = 0
ha1 : e.a1 = 0
hchar' : ↑(ringChar K) = 2
⊢ e.a3 = 0