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 using sinh(x) ? tommy1729 Ultimate Fellow Posts: 1,370 Threads: 335 Joined: Feb 2009 03/01/2016, 10:38 PM In principle a strategy is simple. Show D^n ln(f(exp(x))) is close to D^n f(x) for all n > -1. Write f(x) in the product form prod_i (1 + x^i / a_i) and use log(a b) = log a + log b. So we get ( ignoring radius , continuation , summability ,...) D^n F(x) ~~ D^n Sum_i ln( 1 + exp( i x) / a_i). Use Taylor for ln(1 + x^t) and ln(x^3) = 3 ln(x) etc. Should work. In principle ... In theory ... However in practice this is near impossible !? See here at Gottfried's paper http://go.helms-net.de/math/musings/drea...quence.pdf Also posted on MSE by our friend Mick http://math.stackexchange.com/questions/...of-lnfexpx Regards Tommy1729 « Next Oldest | Next Newest »

 Messages In This Thread using sinh(x) ? - by tommy1729 - 02/28/2010, 12:22 AM RE: using sinh(x) ? - by tommy1729 - 03/06/2010, 12:35 PM RE: using sinh(x) ? - by bo198214 - 03/07/2010, 11:19 AM using 2* sinh(x) ! - by tommy1729 - 03/09/2010, 01:31 PM RE: using 2* sinh(x) ! - by bo198214 - 03/10/2010, 11:38 AM RE: using 2* sinh(x) ! - by tommy1729 - 03/11/2010, 12:50 AM RE: using 2* sinh(x) ! - by tommy1729 - 03/14/2010, 01:07 AM RE: using 2* sinh(x) ! - by sheldonison - 06/02/2010, 04:47 PM RE: using 2* sinh(x) ! - by tommy1729 - 06/02/2010, 10:13 PM RE: using 2* sinh(x) ! - by sheldonison - 06/02/2010, 10:56 PM RE: using 2* sinh(x) ! - by tommy1729 - 06/07/2010, 12:34 AM RE: using 2* sinh(x) ! - by sheldonison - 06/08/2010, 01:59 PM RE: using 2* sinh(x) ! - by tommy1729 - 06/09/2010, 12:18 PM RE: using 2* sinh(x) ! - by mike3 - 06/11/2010, 02:23 AM RE: using 2* sinh(x) ! - by bo198214 - 06/12/2010, 04:36 AM RE: using 2* sinh(x) ! - by mike3 - 06/12/2010, 11:14 AM RE: using 2* sinh(x) ! - by tommy1729 - 06/21/2010, 09:14 PM RE: using 2* sinh(x) ! - by sheldonison - 06/23/2010, 06:06 PM RE: using 2* sinh(x) ! - by tommy1729 - 06/23/2010, 09:11 PM RE: using 2* sinh(x) ! - by tommy1729 - 06/23/2010, 09:31 PM RE: using 2* sinh(x) ! - by bo198214 - 06/27/2010, 09:16 AM RE: using 2* sinh(x) ! - by sheldonison - 06/04/2010, 04:48 AM RE: using sinh(x) ? - by tommy1729 - 04/24/2010, 11:47 PM RE: using sinh(x) ? - by bo198214 - 05/31/2010, 05:52 AM RE: using sinh(x) ? - by tommy1729 - 06/01/2010, 10:58 PM RE: using sinh(x) ? - by bo198214 - 06/02/2010, 02:58 AM RE: using sinh(x) ? - by tommy1729 - 06/22/2010, 11:18 PM RE: using sinh(x) ? - by tommy1729 - 06/23/2010, 10:44 PM RE: using sinh(x) ? - by tommy1729 - 06/24/2010, 12:29 PM RE: using sinh(x) ? - by tommy1729 - 06/24/2010, 07:22 PM RE: using sinh(x) ? - by bo198214 - 06/26/2010, 12:04 PM RE: using sinh(x) ? - by tommy1729 - 06/26/2010, 09:19 PM attracting fixed point of 2sinh - by sheldonison - 06/27/2010, 03:31 AM RE: attracting fixed point of 2sinh - by tommy1729 - 06/28/2010, 11:23 PM RE: attracting fixed point of 2sinh - by sheldonison - 06/29/2010, 03:18 AM RE: attracting fixed point of 2sinh - by tommy1729 - 06/29/2010, 10:45 PM RE: attracting fixed point of 2sinh - by sheldonison - 06/30/2010, 01:12 AM RE: attracting fixed point of 2sinh - by tommy1729 - 06/30/2010, 02:35 PM RE: attracting fixed point of 2sinh - by sheldonison - 06/30/2010, 03:34 PM RE: using sinh(x) ? - by tommy1729 - 07/18/2010, 10:41 PM RE: using sinh(x) ? - by sheldonison - 07/19/2010, 09:37 PM RE: using sinh(x) ? - by tommy1729 - 07/20/2010, 08:24 PM RE: using sinh(x) ? - by tommy1729 - 07/19/2010, 10:20 PM RE: using sinh(x) ? - by sheldonison - 07/20/2010, 03:13 PM RE: using sinh(x) ? - by tommy1729 - 07/20/2010, 08:31 PM RE: using sinh(x) ? - by sheldonison - 07/21/2010, 03:19 AM RE: using sinh(x) ? - by tommy1729 - 07/21/2010, 10:34 PM RE: using sinh(x) ? - by sheldonison - 07/22/2010, 12:23 PM RE: using sinh(x) ? - by tommy1729 - 07/28/2010, 02:24 PM RE: using sinh(x) ? - by tommy1729 - 07/28/2010, 02:53 PM RE: using sinh(x) ? - by tommy1729 - 12/04/2010, 11:09 PM RE: using sinh(x) ? - by tommy1729 - 12/08/2010, 02:31 PM RE: using sinh(x) ? - by sheldonison - 01/17/2011, 07:43 PM RE: using sinh(x) ? - by tommy1729 - 01/17/2011, 11:36 PM RE: using sinh(x) ? - by tommy1729 - 07/02/2011, 10:32 PM RE: using sinh(x) ? - by tommy1729 - 07/04/2011, 10:56 PM RE: using sinh(x) ? - by sheldonison - 07/05/2011, 01:09 AM RE: using sinh(x) ? - by tommy1729 - 07/05/2011, 12:06 PM RE: using sinh(x) ? - by tommy1729 - 11/18/2012, 11:41 PM RE: using sinh(x) ? - by sheldonison - 11/20/2012, 12:01 AM RE: using sinh(x) ? - by tommy1729 - 11/20/2012, 10:53 PM RE: using sinh(x) ? - by sheldonison - 11/20/2012, 11:01 PM RE: using sinh(x) ? - by tommy1729 - 11/20/2012, 11:32 PM RE: using sinh(x) ? - by sheldonison - 11/20/2012, 11:46 PM RE: using sinh(x) ? - by tommy1729 - 11/28/2012, 06:59 PM RE: using sinh(x) ? - by tommy1729 - 11/28/2012, 08:07 PM RE: using sinh(x) ? - by tommy1729 - 12/17/2012, 04:34 PM RE: using sinh(x) ? - by tommy1729 - 02/10/2015, 12:02 AM RE: using sinh(x) ? - by tommy1729 - 04/22/2015, 12:27 PM RE: using sinh(x) ? - by tommy1729 - 04/23/2015, 04:49 PM RE: using sinh(x) ? - by tommy1729 - 10/26/2015, 12:56 AM RE: using sinh(x) ? - by tommy1729 - 11/26/2015, 11:56 PM RE: using sinh(x) ? - by sheldonison - 11/27/2015, 03:41 PM RE: using sinh(x) ? - by tommy1729 - 11/28/2015, 01:21 PM RE: using sinh(x) ? - by sheldonison - 11/29/2015, 03:03 PM RE: using sinh(x) ? - by tommy1729 - 12/01/2015, 01:22 PM RE: using sinh(x) ? - by sheldonison - 12/01/2015, 02:58 PM RE: using sinh(x) ? - by tommy1729 - 12/02/2015, 12:04 AM RE: using sinh(x) ? - by tommy1729 - 12/01/2015, 08:18 PM RE: using sinh(x) ? - by tommy1729 - 12/02/2015, 12:28 AM RE: using sinh(x) ? - by tommy1729 - 02/23/2016, 10:36 PM RE: using sinh(x) ? - by tommy1729 - 02/24/2016, 01:27 PM RE: using sinh(x) ? - by tommy1729 - 03/01/2016, 10:38 PM RE: using sinh(x) ? - by tommy1729 - 03/05/2016, 01:27 PM RE: using sinh(x) ? - by tommy1729 - 03/05/2016, 11:38 PM RE: using sinh(x) ? - by sheldonison - 03/06/2016, 03:16 PM RE: using sinh(x) ? - by tommy1729 - 03/06/2016, 10:54 PM RE: using sinh(x) ? - by tommy1729 - 03/07/2016, 01:48 AM RE: using sinh(x) ? - by tommy1729 - 03/07/2016, 10:46 AM RE: using sinh(x) ? - by tommy1729 - 03/07/2016, 09:36 PM RE: using sinh(x) ? - by tommy1729 - 03/08/2016, 12:26 AM RE: using sinh(x) ? - by tommy1729 - 03/11/2016, 01:27 PM RE: using sinh(x) ? - by tommy1729 - 03/12/2016, 01:12 PM RE: using sinh(x) ? - by tommy1729 - 03/12/2016, 01:20 PM

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