Extension of tetration to other branches  Printable Version + Tetration Forum (https://math.eretrandre.org/tetrationforum) + Forum: Tetration and Related Topics (https://math.eretrandre.org/tetrationforum/forumdisplay.php?fid=1) + Forum: Mathematical and General Discussion (https://math.eretrandre.org/tetrationforum/forumdisplay.php?fid=3) + Thread: Extension of tetration to other branches (/showthread.php?tid=373) Pages:
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RE: Extension of tetration to other branches  mike3  10/25/2009 (10/25/2009, 09:22 PM)bo198214 Wrote:(10/25/2009, 08:47 PM)mike3 Wrote: So an infinite path might be one way of imagining it, or the limit of infinitely many finite paths. So then it would be better to imagine it as a limiting value approached by an infinitely long sequence of results of of finite paths. Every value of , can be indexed by a finite sequence of integers relative to some principal branch, which I call a "branch code". This is what gets plugged into the limit formula I gave. This sequence means that to get to some nonprincipal value for a given , you start at the principal branch, wind times (positive = counterclockwise, negative = clockwise) around , then wind times around , then wind times around , then wind times around , and so on until you have wound times around , and then finally come back to (not winding around any more singularities!) the value that you wanted to evaluate at. However, we can also assign a sort of value to an infinitely long branch code by considering the of the branches obtained with the finite partial branch codes , , , , , and so on. Note that this is not a value of as an analytic multivalued function because, as you say, no finite path (hence none that ends at the point "z" we are evaluating at) gets you there. That such limit values exist makes me wonder what the structure of the Riemann surface must look like. RE: Extension of tetration to other branches  bo198214  10/26/2009 (10/25/2009, 10:56 PM)mike3 Wrote: That such limit values exist makes me wonder what the structure of the Riemann surface must look like. *nods* there seem to be a lot of accumulation points in the branches of one point. Very unlike log which has none. So do you make a picture? RE: Extension of tetration to other branches  mike3  10/26/2009 (10/26/2009, 04:28 AM)bo198214 Wrote:(10/25/2009, 10:56 PM)mike3 Wrote: That such limit values exist makes me wonder what the structure of the Riemann surface must look like. As mentioned, I do not have software that is capable of graphing a multilayered 3d sheet graph. Would just a graph on the real axis be good? i.e. many branches plotted on the same realaxis graph? RE: Extension of tetration to other branches  bo198214  10/26/2009 (10/26/2009, 04:41 AM)mike3 Wrote: Would just a graph on the real axis be good? i.e. many branches plotted on the same realaxis graph? Give it a try. I mean those multilayered pictures are anyway not really helpful as they only show imaginary or real part or the modulus. You wouldnt see accumulation points on those pictures. RE: Extension of tetration to other branches  mike3  10/27/2009 (10/26/2009, 05:07 PM)bo198214 Wrote: Give it a try. Because the points (actually "sheets" as they're not just isolated points) are complex numbers, and so it needs to accumulate in both? RE: Extension of tetration to other branches  bo198214  10/28/2009 (10/27/2009, 08:59 PM)mike3 Wrote: Because the points (actually "sheets" as they're not just isolated points) are complex numbers, and so it needs to accumulate in both? You mean in the real and imaginary part? Of course. The sequence of branches of the real axis (drawn in the complex plane) should converge to a point. Perhaps every point of the complex is then the limit point of some branch sequence. 