How to Approach a Double Exponential Integral?

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Discussion Overview

The discussion centers around approaches to evaluating a double exponential integral of the form $$ \int_{(1)}^{(2)}\exp\left[ a+b\exp\left[ f(x) \right] \right]dx$$. Participants seek strategies and insights into handling such integrals, with a focus on mathematical reasoning and potential substitutions.

Discussion Character

  • Exploratory, Mathematical reasoning

Main Points Raised

  • One participant asks for tips on approaching the integral, indicating that the limits of integration are not crucial.
  • Another suggests substituting $$\ln(z)=f(x)$$ as a potential method for simplification.
  • A different participant presents a derived expression involving an integral and notes the need for more information about the derivative of $$f(x)$$, specifically mentioning $$c=e^b$$ and $$u=\exp(f(x))$$.
  • A participant acknowledges the need to clarify their problem further, indicating an intention to refine their approach.

Areas of Agreement / Disagreement

Participants have not reached a consensus on a specific method for evaluating the integral, and multiple approaches are being explored without resolution.

Contextual Notes

There are unresolved aspects regarding the function $$f(x)$$ and its derivative, which may affect the proposed methods and substitutions.

Who May Find This Useful

Readers interested in advanced calculus, particularly those dealing with complex integrals and mathematical techniques for evaluation.

Steve Zissou
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TL;DR
How to approach this? Integrating a double exponential
Hello frens,

How should one approach this sort of integral? Any tips would be appreciated.

Let's say we have

$$ \int_{(1)}^{(2)}\exp\left[ a+b\exp\left[ f(x) \right] \right]dx$$

...where the limits of integration are not important.

Any tips? Thanks!
 
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Try substituting ln(z)=f(x)
 
I get ##\displaystyle{e^a\int \dfrac{c^u}{u \cdot\dfrac{d}{dx}f(x)}}\,du## so I need more information about ##f',## with ##c=e^b\ ,\ u=\exp(f(x)).##
 
fresh_42 Thank you, I will make my problem a little more..."firm."
 

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