Archimedes 1.2.1

Archimedes 1.2.1 Average ratng: 9,7/10 793 reviews

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Archimedes 1.2.1 Video

(Redirected from 1/2 − 1/4 + 1/8 − 1/16 + · · ·)
Demonstration that 1/21/4 + 1/81/16 + ⋯ = 1/3

In mathematics, the infinite series1/21/4 + 1/81/16 + ⋯ is a simple example of an alternating series that converges absolutely. Aimersoft imusic crack.

It is a geometric series whose first term is 1/2 and whose common ratio is −1/2, so its sum is

Minecraft
n=1(1)n+12n=1214+18116+=121(12)=13.{displaystyle sum _{n=1}^{infty }{frac {(-1)^{n+1}}{2^{n}}}={frac {1}{2}}-{frac {1}{4}}+{frac {1}{8}}-{frac {1}{16}}+cdots ={frac {frac {1}{2}}{1-(-{frac {1}{2}})}}={frac {1}{3}}.}

Hackenbush and the surreals[edit]

A slight rearrangement of the series reads

11214+18116+=13.{displaystyle 1-{frac {1}{2}}-{frac {1}{4}}+{frac {1}{8}}-{frac {1}{16}}+cdots ={frac {1}{3}}.}

The series has the form of a positive integer plus a series containing every negative power of two with either a positive or negative sign, so it can be translated into the infinite blue-red Hackenbush string that represents the surreal number1/3:

LRRLRLR… = 1/3.[1]

A slightly simpler Hackenbush string eliminates the repeated R:

LRLRLRL… = 2/3.[2]

In terms of the Hackenbush game structure, this equation means that the board depicted on the right has a value of 0; whichever player moves second has a winning strategy.

Related series[edit]

  • The statement that 1/21/4 + 1/81/16 + ⋯ is absolutely convergent means that the series 1/2 + 1/4 + 1/8 + 1/16 + ⋯ is convergent. In fact, the latter series converges to 1, and it proves that one of the binary expansions of 1 is 0.111….
  • Pairing up the terms of the series 1/21/4 + 1/81/16 + ⋯ results in another geometric series with the same sum, 1/4 + 1/16 + 1/64 + 1/256 + ⋯. This series is one of the first to be summed in the history of mathematics; it was used by Archimedes circa 250–200 BC.[3]
  • The Euler transform of the divergent series 1 − 2 + 4 − 8 + ⋯ is 1/21/4 + 1/81/16 + ⋯. Therefore, even though the former series does not have a sum in the usual sense, it is Euler summable to 1/3.[4]

Notes[edit]

  1. ^Berkelamp et al. p. 79
  2. ^Berkelamp et al. pp. 307–308
  3. ^Shawyer and Watson p. 3
  4. ^Korevaar p. 325

Archimedes 1.12.2

References[edit]

Archimedes 1.7.10

  • Berlekamp, E. R.; Conway, J. H.; Guy, R. K. (1982). Winning Ways for your Mathematical Plays. Academic Press. ISBN0-12-091101-9.
  • Korevaar, Jacob (2004). Tauberian Theory: A Century of Developments. Springer. ISBN3-540-21058-X.
  • Shawyer, Bruce; Watson, Bruce (1994). Borel's Methods of Summability: Theory and Applications. Oxford UP. ISBN0-19-853585-6.
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