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

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

    1/2 + 1/4 + 1/8 + 1/16 + ⋯. First six summands drawn as portions of a square. 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 ...

  3. 2/1 game forcing - Wikipedia

    en.wikipedia.org/wiki/2/1_game_forcing

    1 ♠ – 22 ♠ – 2NT. Forcing to game, with balanced hand and a good club suit. 1 ♠ – 22 ♦ – 3 ♣ Forcing, unless the partnership has agreed that this is an exception to the "2/1 rule." 1 ♦ – 2 ♣ Forcing for one round only (as in Standard American), except in the variant of 2/1 where this sequence is game forcing as ...

  4. List of floppy disk formats - Wikipedia

    en.wikipedia.org/wiki/List_of_floppy_disk_formats

    5 1 ⁄ 4 inch High 2 77 8 1,024 1,232 kB [NB 11] 360 MFM 3 12 inch SHARP CE-1600F, CE-140F: 2 12 inch [2] [3] Single drive: 1, diskette: 2 16 8 512 2× 64 kB 270 GCR (4/5) Internally based on FDU-250 Micro Floppy Disk Drive Unit [2] Thomson: 5 1 ⁄ 4 inch Single 1 40 16 128 80 kB 300 FM Thomson UD90.070 Double 2 256 320 kB MFM

  5. 1/2 − 1/4 + 1/8 − 1/16 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%E2%88%92_1/4_%2B_1/8...

    1/21/4 + 1/81/16 + ⋯. Demonstration that 1 21 4 + 1 81 16 + ⋯ = 1 3. In mathematics, the infinite series 1/21/4 + 1/81/16 + ⋯ is a simple example of an alternating series that converges absolutely . It is a geometric series whose first term is 1 2 and whose common ratio is − 1 2, so its sum is.

  6. 1/4 + 1/16 + 1/64 + 1/256 + ⋯ - Wikipedia

    en.wikipedia.org/.../64_%2B_1/256_%2B_%E2%8B%AF

    1/4 + 1/16 + 1/64 + 1/256 + ⋯. In mathematics, the infinite series ⁠ 1 4 ⁠ + ⁠ 1 16 ⁠ + ⁠ 1 64 ⁠ + ⁠ 1 256 ⁠ + ⋯ is an example of one of the first infinite series to be summed in the history of mathematics; it was used by Archimedes circa 250–200 BC. [1] As it is a geometric series with first term ⁠ 1 4 ⁠ and common ...

  7. Sopwith 1½ Strutter - Wikipedia

    en.wikipedia.org/wiki/Sopwith_1½_Strutter

    1,439 Great Britain. The Sopwith 11⁄2 Strutter is a British single- or two-seat multi-role biplane aircraft of the First World War. [ 1] It was the first British two-seat tractor fighter and the first British aircraft to enter service with a synchronised machine gun. It was given the name 11⁄2 Strutter because of the long and short cabane ...

  8. Particular values of the Riemann zeta function - Wikipedia

    en.wikipedia.org/wiki/Particular_values_of_the...

    It is known that ζ(3) is irrational (Apéry's theorem) and that infinitely many of the numbers ζ(2n + 1) : n ∈ , are irrational. [1] There are also results on the irrationality of values of the Riemann zeta function at the elements of certain subsets of the positive odd integers; for example, at least one of ζ (5), ζ (7), ζ (9), or ζ ...

  9. AIR-2 Genie - Wikipedia

    en.wikipedia.org/wiki/AIR-2_Genie

    The Douglas AIR-2 Genie (previous designation MB-1) was an unguided air-to-air rocket with a 1.5 kt W25 nuclear warhead. [ 1] It was deployed by the United States Air Force (USAF 1957–1985) and Canada ( Royal Canadian Air Force 1965–1968, Air Command 1968–1984) [ 2] during the Cold War. Production ended in 1962 after over 3,000 were made ...

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