differentiation rules for x[4]n, where n is any natural number
#4
(05/25/2009, 09:31 AM)Ansus Wrote: Great! I've added the rule to our wiki page http://en.wikipedia.org/wiki/User:MathFa...on_Summary

\( (\operatorname{sexp}_x(1))'=1 \)
\( (\operatorname{sexp}_x(n))'=\left((\operatorname{sexp}_x(n-1))'\ln x + \frac{\operatorname{sexp}_x(n-1)}{x}\right)\operatorname{sexp}_x(n) \)

This works also for arbitrary complex \( n=:y \):

\( \frac{\partial}{\partial x} x[4](y+1) = \frac{\partial}{\partial x} x^{x[4]y} =
\frac{\partial}{\partial x} \exp(\ln(x)(x[4]y)) = (x[4](y+1)) \cdot \left(\frac{x[4]y}{x} +\ln(x) \frac{\partial}{\partial x} x[4]y\right) \)
Reply


Messages In This Thread

Possibly Related Threads…
Thread Author Replies Views Last Post
  X-th iteration where x is a real number Natsugou 1 5,671 10/27/2024, 11:23 PM
Last Post: MphLee
  What is this number (\(\dots 98869612812995910644531\))? marcokrt 1 2,811 05/30/2023, 07:09 PM
Last Post: marcokrt
  [UFO] "commutative number theory " f(g) = g(f) tommy1729 0 2,322 03/24/2023, 11:36 PM
Last Post: tommy1729
Question Is the Tetra-Euler Number Rational? Catullus 1 3,335 07/17/2022, 06:37 AM
Last Post: JmsNxn
Question Repeated Differentiation Leading to Tetrationally Fast Growth Catullus 5 8,051 07/16/2022, 07:26 AM
Last Post: tommy1729
Question Natural Properties of the Tetra-Euler Number Catullus 6 10,050 07/01/2022, 08:16 AM
Last Post: Catullus
Question Iterated Hyperbolic Sine and Iterated Natural Logarithm Catullus 2 4,820 06/11/2022, 11:58 AM
Last Post: tommy1729
  Dynamical Systems and Number Theory Daniel 4 9,350 06/01/2021, 11:34 PM
Last Post: JmsNxn
  Approximation to half-iterate by high indexed natural iterates (base on ShlThrb) Gottfried 1 7,580 09/09/2019, 10:50 PM
Last Post: tommy1729
  Cellular auto : rule 30 number ? tommy1729 0 5,233 08/03/2016, 08:31 PM
Last Post: tommy1729



Users browsing this thread: 1 Guest(s)