# .999 = 1?

**URL:** <https://boards.straightdope.com/t/999-1/27517>\
**Category:** Factual Questions\
**Created:** [July 31, 2000, 6:28am UTC](https://boards.straightdope.com/t/999-1/27517 "2000-07-31T06:28:03Z")\
**Posts on this page:** 1\
**Showing post:** 989

<div class="post-metadata">

**Author:** ![Derleth](https://avatars.discourse-cdn.com/v4/letter/d/b9e5f3/32.png) [@Derleth](https://boards.straightdope.com/u/Derleth)\
**Post date:** [October 2, 2012, 6:28am UTC](https://boards.straightdope.com/t/999-1/27517/989 "2012-10-02T06:28:03Z")

</div>

[I’d be remiss if I didn’t mention (eventually) that _Calculus Made Easy_ is an introductory calculus textbook which develops the whole subject in terms of infinitesimals.](http://en.wikipedia.org/wiki/Calculus_Made_Easy) It actually predates Robinson, so it doesn’t use the hyperreals, but it’s precisely the same general idea.

[_Calculus Made Easy_ is public domain, and it’s available for free download from Project Gutenberg.](http://www.gutenberg.org/etext/33283)

---

_[View the full topic](https://boards.straightdope.com/t/999-1/27517)._