Real number in terms of infinite series A = a 0 </msub> + (

Amber Quinn

Amber Quinn

Answered question

2022-06-20

Real number in terms of infinite series
A = a 0 + ( 1 a 1 ) k + ( 1 a 2 ) k + ( 1 a 3 ) k +
Where i 1 and the recurrence relation a i + 1 a i 2

Answer & Explanation

crociandomh

crociandomh

Beginner2022-06-21Added 19 answers

Given that from your condition it is allowed that a i + 1 = a i , if k is integer, you can reduce the problem for k > 1 to the case k = 1 by repeating 1 / a i k for a i k 1 times before using a new value. By doing that repetition, you get a sum of a i k 1 / a i k = 1 / a i
Example:
Say your k = 1 expansion is
A = 1 + 1 / 2 + 1 / 8 +
and k = 2. Then your new expansion reads
A = 1 + ( 1 2 ) 2 + ( 1 2 ) 2 = 1 + ( 1 8 ) 2 + ( 1 8 ) 2 + ( 1 8 ) 2 + ( 1 8 ) 2 = 1 + ( 1 8 ) 2 + ( 1 8 ) 2 + ( 1 8 ) 2 + ( 1 8 ) 2 +
Since every real number can be written as the product of an integer and a real number in the range [ 1 , 2 ), the same strategy can be used to reduce the problem for arbitrary non-integer k > 1 to the problem 1 < k < 2

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