# e^i(pi) = -1; proof?

**URL:** <https://boards.straightdope.com/t/e-i-pi-1-proof/170919>\
**Category:** Factual Questions\
**Created:** [April 24, 2003, 6:39pm UTC](https://boards.straightdope.com/t/e-i-pi-1-proof/170919 "2003-04-24T18:39:02Z")\
**Posts on this page:** 2\
**Page:** 2

<div class="post-metadata">

**Author:** ![bryanmcc](https://avatars.discourse-cdn.com/v4/letter/b/eada6e/32.png) [@bryanmcc](https://boards.straightdope.com/u/bryanmcc)\
**Post date:** [April 25, 2003, 7:44pm UTC](https://boards.straightdope.com/t/e-i-pi-1-proof/170919/21 "2003-04-25T19:44:56Z")

</div>

> [@](#):
>
> \*Originally posted by ultrafilter \*  
> \*\*I always liked it better as e[sup][symbol]ip[/symbol][/sup] + 1 = 0. \*\*

I _love_ that equation. Anyone know where I can get it on a t-shirt?

I’d also love a shirt with ∫[sub]1[/sub][sup][sup]3[/sup]√3[/sup]z[sup]2[/sup]dz_cos(3[symbol]p[/symbol]/9) = ln([sup]3[/sup]√_e\*)

(It’s a limerick. ;))

PS- I think I deserve a t-shirt for the bitch of a job that coding was.

---

<div class="post-metadata">

**Author:** ![Dewey\_Finn](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/dewey_finn/32/4222_2.png) [@Dewey\_Finn](https://boards.straightdope.com/u/Dewey_Finn)\
**Post date:** [July 7, 2014, 8:38pm UTC](https://boards.straightdope.com/t/e-i-pi-1-proof/170919/23 "2014-07-07T20:38:03Z")

</div>

Reported.

[Previous page](https://boards.straightdope.com/t/e-i-pi-1-proof/170919.md?page=1)