simp [one_ne_zero, hn]
case e_a.e_a.e_s
R : Type u_1
ι : Type u_2
inst✝ : CommSemiring R
i j : ι
n : ℕ
hn : 0 < n
r : R
a✝ : Nontrivial R
this : (X j ^ n + C r).totalDegree = n
⊢ (C r).totalDegree < ((monomial (Finsupp.single j n)) 1).totalDegree
no goals