continued fractions


by Klaus_Hoffmann
Tags: continued, fractions
Klaus_Hoffmann
Klaus_Hoffmann is offline
#1
Jul21-07, 03:25 PM
P: 83
Hi, my question is given the recurrence relation for the convergents, could we construct a continued fraction so..

[tex] \alpha = a_{0}+ \frac{b_{0}}{a_{1}+\frac{b_{1}}{a_{2}}+.... [/tex]

all the coefficients a's and b's are equal to a certain integer ?

for example if all the coefficients (numerators and denomiators)

* are one we have just the Fibonacci (Golden ratio) constant [tex] \frac{2}{\sqrt 5 -1} [/tex]

* are two we have exactly [tex] \sqrt 2 +1 [/tex]

i the sense that expanding the 2 numbers above their continued fraction is made only by 1 or 2, but can we construct a general continued fraction with all the numbers equal to 3,4,5,6,......
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ramsey2879
ramsey2879 is offline
#2
Jul26-07, 11:26 AM
P: 891
Quote Quote by Klaus_Hoffmann View Post
Hi, my question is given the recurrence relation for the convergents, could we construct a continued fraction so..

[tex] \alpha = a_{0}+ \frac{b_{0}}{a_{1}+\frac{b_{1}}{a_{2}}+.... [/tex]

all the coefficients a's and b's are equal to a certain integer ?

for example if all the coefficients (numerators and denomiators)

* are one we have just the Fibonacci (Golden ratio) constant [tex] \frac{2}{\sqrt 5 -1} [/tex]

* are two we have exactly [tex] \sqrt 2 +1 [/tex]

i the sense that expanding the 2 numbers above their continued fraction is made only by 1 or 2, but can we construct a general continued fraction with all the numbers equal to 3,4,5,6,......
Something doesn't seem right. If making all the a's and b's 1 gives the Fibonacci (golden ratio) constant, wouldn't making all the a's and b's 2 simply be 2 times the Golden ration rather than [tex] \sqrt 2 + 1 [/tex].

Postscript. On the other hand: It seemed to me that any similar manner of construction a continued fraction will give an irrational number of some fixed value which would be a multiple of the continued fraction comprising only ones, but then n/n = 1 so I guess I made a mistake. Anyway at least the numbers are completely predefined.


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