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Exponentially Decreasing Function


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ExponentiallyDecreasingFunction

An exponentially decreasing function, in the constant-rate exponential decay model, has the form

 f(x)=Ae^(-cx),

where A>0 and c>0 are constants. Its derivative satisfies f^'(x)=-cf(x) (Strang and Herman 2016). The prototypical example is the exponential function e^(-x), plotted above.

Decay faster than every inverse power does not by itself imply exponential decay. For example, e^(-sqrt(x)) decreases faster than x^(-n) for every fixed n>0 as x->infty, but more slowly than e^(-cx) for every fixed c>0.


See also

Exponential Function, Exponentially Increasing Function, Logarithmically Decreasing Function, Logarithmically Increasing Function

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References

Strang, G. and Herman, E. J. "Exponential Growth and Decay." §6.8 in Calculus Volume 1. Houston, TX: OpenStax, 2016. https://openstax.org/books/calculus-volume-1/pages/6-8-exponential-growth-and-decay.

Referenced on Wolfram|Alpha

Exponentially Decreasing Function

Cite this as:

Weisstein, Eric W. "Exponentially Decreasing Function." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ExponentiallyDecreasingFunction.html

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