Monday, July 15, 2019

calculus - Recursive square root problem



Give a precise meaning to evaluate the following:
$$\large{\sqrt{1+\sqrt{1+\sqrt{1+\sqrt{1+\dotsb}}}}}$$




Since I think it has a recursive structure (does it?), I reduce the equation to



$$
p=\sqrt{1+p}
$$
$$

p^2=1+p
$$
$$
p^2-p-1=0
$$
$$
p=\frac{1\pm\sqrt{5}}{2}
$$



Did I do this right?

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