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 Infinite tetration and superroot of infinitesimal bo198214 Administrator Posts: 1,386 Threads: 90 Joined: Aug 2007 02/01/2008, 09:29 PM (This post was last modified: 02/01/2008, 09:38 PM by bo198214.) Hey Gianfranco, open your eyes! Catastrophe theory will not solve your problems with multivalued functions, nor will the use of the term "multivalued function". I think I clarified in detail what terms are there and how to use them: 1. There is an analytic function (single valued) 2. If the function has only isolated singularities choose slices starting at the singularities for extending this function (uniquely/single valued) to the sliced complex plane. 3. Determine branches of the function by paths that cross the slices. If your original analytic function $f$ is not injective, you can invert it at a point with $f'(x_0)\neq 0$. That means there is a unique inversion $f^{-1}$ in a neighborhood of $(x_0,f(x_0))$. If you look at the branches of $f^{-1}$ you will find among them also the other values $x$ for which $f(x)=y$, i.e. for each $x$ with $f(x)=y$ there will be a branch ${f^{-1}}_k$ such that ${f^{-1}}_k(y)=x$. Or in other words for each $x$ there is a $k$ such that ${f^{-1}}_k(f(x))=x$. For example the function $\sqrt{x}$ (sliced as usual) has the branches $\sqrt{x}_k = (-1)^k \sqrt{x}$, i.e. at all only 2 branches that is $\sqrt{x}$ and $-\sqrt{x}$. And hence $\sqrt{x^2}$ is not always equal to $x$ but we have to choose the right branch for example $-\sqrt{(-2)^2}=-2$ and $\sqrt{2^2}=2$. In general we have merely $\sqrt{x^2}=|x|$. And no multivalued function consideration will save you from considering this. « Next Oldest | Next Newest »

 Messages In This Thread Infinite tetration and superroot of infinitesimal - by Ivars - 12/16/2007, 06:02 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 12/17/2007, 02:27 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/18/2007, 02:59 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/19/2007, 08:42 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/19/2007, 04:03 PM RE: Infinite tetration and superroot of infinitesimal - by jaydfox - 12/19/2007, 06:29 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/19/2007, 08:55 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/20/2007, 08:23 AM RE: Infinite tetration and superroot of infinitesimal - by andydude - 12/20/2007, 06:31 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 12/20/2007, 03:16 AM RE: Infinite tetration and superroot of infinitesimal - by jaydfox - 12/20/2007, 07:25 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/20/2007, 09:02 PM RE: Infinite tetration and superroot of infinitesimal - by jaydfox - 12/20/2007, 09:08 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/20/2007, 09:50 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 12/21/2007, 02:08 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/21/2007, 05:49 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 12/21/2007, 08:06 PM RE: Infinite tetration and superroot of infinitesimal - by jaydfox - 12/21/2007, 08:40 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/21/2007, 10:41 PM RE: Infinite tetration and superroot of infinitesimal - by jaydfox - 12/21/2007, 11:00 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/24/2007, 09:56 AM RE: Infinite tetration and superroot of infinitesimal - by jaydfox - 12/24/2007, 04:40 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/25/2007, 09:31 AM RE: Infinite tetration and superroot of infinitesimal - by andydude - 12/25/2007, 06:46 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/25/2007, 09:37 PM RE: Infinite tetration and superroot of infinitesimal - by jaydfox - 12/26/2007, 09:27 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/04/2008, 06:51 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/04/2008, 07:08 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/04/2008, 09:48 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/05/2008, 07:37 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/05/2008, 07:49 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/05/2008, 10:30 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/06/2008, 01:10 AM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/06/2008, 09:42 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/06/2008, 04:54 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/06/2008, 09:26 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 12/28/2007, 12:31 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/02/2008, 08:56 AM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/02/2008, 10:34 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/02/2008, 11:47 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/05/2008, 09:38 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/07/2008, 10:04 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/08/2008, 08:28 AM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/08/2008, 08:52 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/08/2008, 03:44 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/09/2008, 12:50 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/09/2008, 01:53 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/08/2008, 03:41 PM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/08/2008, 11:44 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/10/2008, 09:19 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/13/2008, 01:14 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/15/2008, 01:09 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/23/2008, 11:25 AM RE: Infinite tetration and superroot of infinitesimal - by andydude - 01/25/2008, 10:52 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/23/2008, 05:13 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/23/2008, 07:52 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/23/2008, 09:22 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/24/2008, 03:44 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/25/2008, 03:13 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/25/2008, 11:36 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/26/2008, 02:13 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/26/2008, 04:01 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/27/2008, 01:03 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/27/2008, 12:24 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/27/2008, 06:56 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/27/2008, 08:51 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/28/2008, 02:25 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/28/2008, 03:36 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/28/2008, 09:49 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/28/2008, 10:29 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/30/2008, 09:56 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/30/2008, 04:09 PM RE: Infinite tetration and superroot of infinitesimal - by bo198214 - 01/30/2008, 05:09 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/30/2008, 07:28 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/30/2008, 08:21 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/31/2008, 07:41 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/31/2008, 11:13 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 01/31/2008, 03:56 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 01/31/2008, 05:06 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/01/2008, 07:42 AM RE: Infinite tetration and superroot of infinitesimal - by GFR - 02/01/2008, 10:31 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/01/2008, 11:14 AM RE: Infinite tetration and superroot of infinitesimal - by GFR - 02/01/2008, 08:56 PM RE: Infinite tetration and superroot of infinitesimal - by bo198214 - 02/01/2008, 09:29 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/01/2008, 10:00 PM RE: Infinite tetration and superroot of infinitesimal - by GFR - 02/02/2008, 03:31 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/05/2008, 10:58 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/06/2008, 07:43 PM RE: Infinite tetration and superroot of infinitesimal - by bo198214 - 02/26/2008, 09:26 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/26/2008, 09:31 PM RE: Infinite tetration and superroot of infinitesimal - by bo198214 - 02/26/2008, 10:23 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/27/2008, 09:36 AM RE: Infinite tetration and superroot of infinitesimal - by bo198214 - 02/27/2008, 03:14 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 02/27/2008, 09:00 PM RE: Infinite tetration and superroot of infinitesimal - by bo198214 - 03/13/2008, 08:30 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 04/05/2008, 06:42 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 05/10/2008, 08:33 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 06/27/2008, 04:51 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 07/04/2008, 07:02 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 07/04/2008, 09:01 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 07/05/2008, 08:12 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 10/16/2008, 10:39 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 07/05/2008, 11:26 AM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 07/10/2008, 12:26 PM RE: Infinite tetration and superroot of infinitesimal - by Ivars - 07/11/2008, 09:27 AM

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