William L. Hosch
Former Encyclopædia Britannica Editor
William L. Hosch was an editor at Encyclopædia Britannica.
Primary Contributions (151)
Geometric series, in mathematics, an infinite series of the form a + ar + ar2 + ar3+⋯, where r is known as the common ratio. A simple example is the geometric series for a = 1 and r = 1/2, or 1 + 1/2 + 1/4 + 1/8 +⋯, which converges to a sum of 2 (or 1 if the first term is excluded). The Achilles…
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