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 sexp for base (1/e)^e ~= 0.0660? sheldonison Long Time Fellow Posts: 639 Threads: 22 Joined: Oct 2008 03/06/2013, 11:57 PM (This post was last modified: 03/07/2013, 12:23 AM by sheldonison.) Can it have a Tetration superfunction with sexp(-1)=0, sexp(0)=1, sexp(1)=b, sexp(2)=b^b? This is a base on the shellthron boundary, with one fixed point $L=\frac{1}{e}$ where $b^L=L$ and $b={(\frac{1}{e})}^e\approx 0.065988$ This base has a rationally indifferent multiplier=-1, which has a pseudo period=2. Because the multiplier is an exact root of unity, rather than an irrational root of unity, this base doesn't have a Schroeder function. $b^{L+x}\approx L-x+1.35914x^2-1.23151x^3+...$ Iterating this function starting with z=1 doesn't lead to behavior that seem much like Tetration. I was curious if it was possible to generate an sexp(z) solution given that I think there is only one fixed point, and that the fixed is rationally indifferent, in this case with a pseudo period of 2. As I understand it, the abel function for this function, would be generated from b^b^z. If you iterate the b^z function twice, b^b^z would be a parabolic case with an Abel function for each of the four leaves on the Leau-Fatou flower. But I don't know how you can combine these four Abel functions together into a single inverse abel function for b^z. Note in the equation below, that there is no x^2 term. $b^{b^{L+x}}\approx L+x-1.2315x^3+0.836897x^4+...$ At the real axis starting close to the fixed point and iterating twice always gets you a little bit closer to the fixed point, but the convergence is very slow. For example, starting with z=0, iterating z=b^z oscillates towards the fixed point. I generated some results and graphs for a complex base on the shellthron boundary with a rationally indifferent fixed point with a multiplier of $\exp(\frac{2\pi i}{5})$, with a pseudo period=5, which also lacks a Schroeder function because the multiplier is a 5th root of unity; the other fixed point is repelling. See post #10 of this thread, http://math.eretrandre.org/tetrationforu...hp?tid=729 This result was generated via the conjectured merged complex tetration solution, using both fixed points of the base. It seems that if there is a solution for other rationally indifferent roots of unity on the Shell Thron boundary, than there could be a solution for this base as well. In the upper half of the complex plane, such a solution for base (1/e)^e might only be well behaved near the imaginary axis, exponentially converging towards the fixed point as $\Im(z)$ increases much like the conjectured solution with pseudo period=5. Such a solution would become increasingly chaotic as real(z) increased or decreased. I have no idea what the solution could look like in the lower half of the complex plane, since I think there is only one fixed point. - Sheldon « Next Oldest | Next Newest »

 Messages In This Thread sexp for base (1/e)^e ~= 0.0660? - by sheldonison - 03/06/2013, 11:57 PM RE: sexp for base (1/e)^e ~= 0.0660? - by tommy1729 - 03/07/2013, 12:01 AM RE: sexp for base (1/e)^e ~= 0.0660? - by mike3 - 03/08/2013, 06:18 AM RE: sexp for base (1/e)^e ~= 0.0660? - by sheldonison - 03/08/2013, 02:30 PM RE: sexp for base (1/e)^e ~= 0.0660? - by mike3 - 03/09/2013, 06:00 AM RE: sexp for base (1/e)^e ~= 0.0660? - by sheldonison - 03/09/2013, 08:25 AM RE: sexp for base (1/e)^e ~= 0.0660? - by sheldonison - 03/10/2013, 06:35 AM RE: sexp for base (1/e)^e ~= 0.0660? - by sheldonison - 11/13/2013, 01:08 AM RE: sexp for base (1/e)^e ~= 0.0660? - by sheldonison - 11/13/2013, 06:45 PM

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