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### What is e? A Ratio?

```
Date: 7/25/96 at 21:2:51
From: Anonymous
Subject: What is e? A ratio?

I am a high school math teacher.  Yesterday at a conference an old
buddy of mine asked me where e came from.  I said huh?  He said well,
pi is of course the ratio of the circumference of a circle to its
diameter.  There must be some similar explanation for e.

Is there?
```

```
Date: 7/26/96 at 0:30:4
From: Doctor Paul
Subject: Re: What is e? A ratio?

'e' isn't a ratio. Rather, it's a limit.

n
e = Limit         (1 + 1/n)
n -> infinity

'e' can also be expressed as a sum:

infinity
-----
\        1
e =    )      ---
/        i!
-----
i = 0

-Doctor Paul,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/
```
Associated Topics:
High School Transcendental Numbers

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