diff --git a/guide/english/mathematics/e-constant/index.md b/guide/english/mathematics/e-constant/index.md index aa032aeced..8f68ca375c 100644 --- a/guide/english/mathematics/e-constant/index.md +++ b/guide/english/mathematics/e-constant/index.md @@ -12,6 +12,8 @@ E is a constant which we can use to observe the behavior of exponential function Furthermore, the inverse of e^x is ln(x), the base logarithmic function. OF particular importance, ln(e) = 1. +The domain of y=e^x is (-infinity,infinity). + http://www.mathsisfun.com/numbers/e-eulers-number.html #### More Information: More information about e, exponential, and logarithmic functions can be found [here](https://www.khanacademy.org/tag/natural-logarithm-and-e)