simp only [gt_iff_lt, lt_one_iff, mem_Icc, true_and, not_le, Icc_erase_left]
case h₂
n : ℕ
hn : 1 ≤ n
⊢ ∑ x ∈ (Icc 1 n).erase 1, (↑x)⁻¹ ≤ (↑n).log
case h₂
n : ℕ
hn : 1 ≤ n
⊢ ∑ x ∈ Ioc 1 n, (↑x)⁻¹ ≤ (↑n).log