Exponential Convergence: Solving the Integral from 0 to Infinity of exp(-x)

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Homework Help Overview

The discussion revolves around the convergence of the integral from 0 to infinity of the function exp(-x). Participants are exploring whether this convergence is accepted as a fact or requires proof.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need for proof regarding the convergence of the integral and suggest evaluating the limit of the integral as the upper bound approaches infinity. There is also mention of finding an antiderivative for the integrand.

Discussion Status

The conversation includes attempts to clarify the convergence of the integral, with some participants acknowledging the known result of the integral converging to 1. However, there is no explicit consensus on the necessity of proof.

Contextual Notes

One participant notes a lack of shown work, indicating that assumptions about the integral's convergence may not be fully substantiated in the discussion.

Mattofix
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[SOLVED] exponential converge?

Homework Statement



does the integral from 0 to infinty of exp(-x) converge - if so, is it just accepted or does it need to proven?
 
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\int_0^{\infty}e^{-x}dx it is convergent and it needs to be proven!
you might want to go like this, although you haven't shown your work at all!

\lim_{b \rightarrow \infty} \int_0^{b}e^{-x}dx, now can you find an antiderivative for the integrand e^{-x}
 
thanks - yeah, sorry i havnt shown any working- i know it converegs to 1 though.
 
Mattofix said:
thanks - yeah, sorry i havnt shown any working- i know it converegs to 1 though.

Yeah after u evaluate that limit, you will end up with 1. good job!
 

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