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A polynomial decomposition may enable more efficient evaluation of a polynomial. For example, + + + + + + + = () (+ +) can be calculated with 3 multiplications and 3 additions using the decomposition, while Horner's method would require 7 multiplications and 8 additions.
3/10: 3/40: 9/40 4/5: 44/45: −56/15: 32/9 8/9: 19372/6561: −25360/2187: 64448/6561: −212/729 1: 9017/3168: −355/33: 46732/5247: 49/176: −5103/18656 1: 35 ...
Derivative Accuracy −5 −4 −3 −2 −1 0 1 2 3 4 5 1 2 −1/2: 0: 1/2: 4 1/12: −2/3: 0: 2/3: −1/12: 6 −1/60: 3/20: −3/4: 0: 3/4: −3/20: 1/60: 8 1/280 ...
In general, similar integrals have value π / 2 whenever the numbers 3, 5, 7… are replaced by positive real numbers such that the sum of their reciprocals is less than 1. In the example above, 1 / 3 + 1 / 5 + … + 1 / 13 < 1, but 1 / 3 + 1 / 5 + … + 1 / 15 > 1.
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.
Demonstration of 2 / 3 via a zero-value game. A slight rearrangement of the series reads + + =. 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 number 1 / 3 :
The first four partial sums of the series 1 + 2 + 3 + 4 + ... The parabola is their smoothed asymptote; its y-intercept is −1/12. [1]The infinite series whose terms ...