• anonymous
MIT 6.001 Structure and Interpretation of Computer Programs, Spring 2005
  • Stacey Warren - Expert
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  • katieb
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  • anonymous
sqrt(1+3sqrt(1+3sqrt(1+(...)))) > y > sqrt(1+2sqrt(1+2sqrt(...))) Which means LHS is solution of y^2-3y-1 and RHS is solution of y^2-2y-1 => (3+sqrt(13))/2 > y > 1+sqrt(2) => 3.3 > y > 2.414 Siddhi, I think the left hand side of your inequality is incorrect -- the factor is usually larger than 3. I don't know the answer to this question, but my guess is that the value is infinite. The square root of a very large number is still fairly large, and if you multiply that by anothr large number and take the square root you'll get an even larger number than the first square root. Perhaps you can program a computer to try this for some large, finite sequence. Hburgiel, No its a finite number, The factors become more and more insignificant as the proceed INTO the roots, So in reality the number is converging to a finite number. PS: I tried on google with increasing finite number and the number increases but with a decreasing slope, decreasing rate. (I felt it to be converging to the finite number 3) amogh, though the number increases but with decreasing slope, decreasing rate, it doesn't mean that the number is not infite --- consider the harmony series \sum{\frac{1}{n}} Yes you are right luckyted, My explanation was not right but it is converging, Sorry I can't prove it but that's what I noticed! yes amogh,u r write...its a finite number n its 3 but how do u solve it or guess? I'm thinking on it, I'll post it here if I come up to anything good! Based on Siddhi's work, it follows that, there exists one x such that, and 2 sqrt(1+2sqrt(1+3sqrt(1+4sqrt(1+........)))) (y^2-1)/2 > y y^2-2y-1>0 and we have y>0 these two simultaneous conditions leads us to a solution that y>2.414. See first of all, its obvious why y> sqrt(1+2 sqrt(1+ 2 sqrt(...))), isn't it? OK, I'm back from work. sqrt{3} > sqrt{sqrt{4}} > sqrt{sqrt{sqrt{5}}} ..... So what I'm trying to say is that the significance of the numbers goes on decreasing from left to right, ie. into the roots. sqrt{n}>sqrt{sqrt{n+1}} only when n is finite no, in case of any infinite no how can you say this!!!! the given series has no termination.

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