Theorem: sum_telescopic (PrimeNumberTheoremAnd/Wiener.lean)

State before:
n✝ : ℕ
A a✝ b c d u x y t σ' : ℝ
ψ Ψ : ℝ → ℂ
F G : ℂ → ℂ
f : ℕ → ℂ
𝕜 : Type
inst✝ : _root_.RCLike 𝕜
a : ℕ → ℝ
n : ℕ
⊢ ∑ i ∈ Finset.range n, (a (i + 1) - a i) = a n - a 0
Tactic:
apply Finset.sum_range_sub
State after:
no goals