Difficult implicit function in mathematica.

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SUMMARY

The discussion focuses on solving a complex implicit function numerically using Mathematica version 7.0.1.0. The function involves multiple integrals and parameters, specifically constants for c and rho, which the user plans to modify later. The user seeks guidance on how to implement this in Mathematica, indicating that the problem is challenging and they are new to this type of numerical solution. The discussion also includes a method for formatting Mathematica code for better readability in forum posts.

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  • Understanding of implicit functions and numerical solutions
  • Familiarity with Mathematica, specifically version 7.0.1.0
  • Knowledge of integral calculus and its application in programming
  • Basic skills in formatting code for readability in forums
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  • Learn about the use of constants and step functions in Mathematica
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  • Investigate best practices for formatting Mathematica code for online discussions
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Mathematics students, researchers in computational mathematics, and anyone working with numerical methods in Mathematica.

Warri
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Hi everybody. I have an impicit function that I want to solve numerically in mathematica it looks like:

Code:
f[x] == b1 \!\(
\*SubsuperscriptBox[\(\[Integral]\), \(0\), \(L\)]\(c[
      x, \[Alpha]] f[\[Alpha]] 
SuperscriptBox[\(E\), \(-\(
\*SubsuperscriptBox[\(\[Integral]\), \(0\), \(\[Alpha]\)]f[\[Eta]] \
\[DifferentialD]\[Eta]\)\)] \[DifferentialD]\[Alpha]\)\) + b2 \!\(
\*SubsuperscriptBox[\(\[Integral]\), \(0\), \(L\)]\(c[
      x, \[Alpha]] \[Rho][\[Alpha]] \(
\*SubsuperscriptBox[\(\[Integral]\), \(0\), \(\[Alpha]\)]f[\[Xi]] 
SuperscriptBox[\(E\), \(\(-\(
\*SubsuperscriptBox[\(\[Integral]\), \(0\), \(\[Xi]\)]f[\[Eta]] \
\[DifferentialD]\[Eta]\)\) - 
\*SubsuperscriptBox[\(\[Integral]\), \(\[Xi]\), \(\[Alpha]\)]\[Rho][\
\[Eta]] \[DifferentialD]\[Eta]\)] \[DifferentialD]\[Xi] \
\[DifferentialD]\[Alpha]\)\)\)

(It's my first time doing something like this so if the code does not work, please say so)

When I put it in mathematica f will be the only unknown. For simplicity it can be assumed at first that c is constant (This one is already solvable for me, next it will probably be a step function, not continuous) and rho is constant (it will be some smooth function)

This is for me a rather hard cookie to crack. I hope there is someone who reads this who can tell me how to do this. Sorry I don't have all the functions yet.

Edit: I use mathematica version 7.0.1.0
 
Last edited:
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Block-it, Cell/Convert To/Raw Input form.

That above is what you have to do to cut-and-paste Mathematica-formatted code into a post here without all the unnecessary formatting codes that this forum can't interpret anyway. Granted, you loose all the nicely-formatted math forms and sometimes it's still hard to read, but the reader, if they wished, can invert that by cutting the text out of this forum, pasting it into a Mathematica notebook, then:

Block-it/Cell/Convert To/Standard Form

And that gives an easier read.
 
Last edited:

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