no goals
𝕂 : Type u_2
𝔸 : Type u_1
inst✝⁵ : Field 𝕂
inst✝⁴ : Ring 𝔸
inst✝³ : Algebra 𝕂 𝔸
inst✝² : TopologicalSpace 𝔸
inst✝¹ : TopologicalRing 𝔸
inst✝ : T2Space 𝔸
⊢ exp 𝕂 0 = 1
simp_rw [exp_eq_tsum, ← expSeries_apply_eq, expSeries_apply_zero, tsum_pi_single]