Leibniz's Criterion/Test/Rule - Alternating Series Test

• (𝑎_𝑛)𝑛∊ℕ is a convergent sequence with 𝑙𝑖𝑚_𝑛→∞𝑎_𝑛=0 and is monotonically decreasing → 𝛴_{1≤𝑖≤∞}(-1)^𝑖𝑎_𝑖 is a convergent series

Leibniz's Criterion - Proof