An alternating series is a series which alternates between positive and negative terms. For instance, the series 1, -2, 3, -4, 5, -6, 7…. is alternating. It is a series in the form Σ∞k = 1 (-1)k + 1 ak.
“Alternating Series.” From Wolfram MathWorld, mathworld.wolfram.com/AlternatingSeries.html.
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