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  2. 1 − 2 + 3 − 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_2_%2B_3_%E2%88...

    The idea becomes clearer by considering the general series 1 − 2x + 3x 2 − 4x 3 + 5x 4 − 6x 5 + &c. that arises while expanding the expression 1 ⁄ (1+x) 2, which this series is indeed equal to after we set x = 1.

  3. 1/2 + 1/4 + 1/8 + 1/16 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/...

    The geometric series on the real line. In mathematics, the infinite series 1 2 + 1 4 + 1 8 + 1 16 + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation, this may be expressed as. The series is related to philosophical questions considered in antiquity, particularly ...

  4. 1 + 2 + 4 + 8 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_4_%2B_8_%2B_%E...

    In mathematics, 1 + 2 + 4 + 8 + ⋯ is the infinite series whose terms are the successive powers of two. As a geometric series, it is characterized by its first term, 1, and its common ratio, 2. As a series of real numbers it diverges to infinity, so the sum of this series is infinity. However, it can be manipulated to yield a number of ...

  5. Smith & Wesson Model 1 1/2 - Wikipedia

    en.wikipedia.org/wiki/Smith_&_Wesson_Model_1_1/2

    The third issue of the Model 1 + 12 is known as the "Model 1 + 12 Single Action Revolver". It differs substantially from the first two issues by breaking at the top (just in front of the hammer), consistent with the design of the Safety Hammerless or S&W .38 Single Action. It can be readily distinguished from the first two issues by ...

  6. Grandi's series - Wikipedia

    en.wikipedia.org/wiki/Grandi's_series

    1 = 2S, resulting in S = 1 / 2. The same conclusion results from calculating −S (from −S = (1 − S) − 1), subtracting the result from S, and solving 2S = 1. The above manipulations do not consider what the sum of a series actually means and how said algebraic methods can be applied to divergent geometric series. Still, to the extent that ...

  7. 1 − 1 + 2 − 6 + 24 − 120 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_1_%2B_2_%E2%88...

    11 + 2 − 6 + 24 − 120 + ⋯. In mathematics, is a divergent series, first considered by Euler, that sums the factorials of the natural numbers with alternating signs. Despite being divergent, it can be assigned a value of approximately 0.596347 by Borel summation .

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