A popular math joke is:

*Q: Why do mathematicians like parks?
A: Because of all the natural logs.*

The natural logarithm ("natural logs") joke has been cited in print since at least 2006. “Q: Why do mathematicians like forests? A: Natural logs!” was cited on Twitter on March 2, 2009.

Wikipedia: Natural logarithm

The

*natural logarithm*of a number is its logarithm to the base of the mathematical constant e, where e is an irrational and transcendental approximately equal to 2.718281828459. The natural logarithm of x is generally written as ln x, loge x, or sometimes, if the base e is implicit, simply log x. Parentheses are sometimes added for clarity, giving ln(x), loge(x) or log(x). This is done in particular when the argument to the logarithm is not a single symbol, to prevent ambiguity.

Wikipedia: Mathematical joke (6 October 2006 page revision)

A

*mathematical joke*is a form of professional humor which relies on aspects of mathematics or a stereotype of mathematicians to derive humor. The humor may come from a pun or double meaning of a mathematical term, or on a non-mathematician’s misunderstanding of a mathematical concept. Such jokes are frequently inaccessible to those without a mathematical bent.

*Pun-based jokes*

Why do Mathematicians like national parks?

Because of the natural logs.

mafiascum

*Alduskkel*

Thu Feb 12, 2009 6:45 am

Why do mathematicians like parks? For all the natural logs!

Hilary Mason

@hmason

I am WAY too amused by the Wikipedia ‘mathematical joke’ page: http://bit.ly/2PI3 Q: Why do mathematicians like forests? A: Natural logs!

9:03 AM - 2 Mar 2009

Studentawards Forum

Physics, math, engineering & comsci jokes

*Superman6424*

Posted: January 25, 2010 4:39:30 PM

(...)

Why do mathematicians like parks?

Because of the natural logs.

Ms. Barbara Woodcock

@mswoodcockmath

Why do mathematicians like forests? Because they’re full of natural logs! #MathJokeMonday

6:47 AM - 4 Nov 2013

Jake Thiessen

@TotesJake

@JessicaNaslund

Why do mathematicians like parks?

Because of all the natural logs

9:59 PM - 30 Apr 2014

Holiday Inn Express

@hiegeorgetown

Have you ever wondered why mathematicians like parks? I found out it was because of all the natural logs. #mathjokes

7:15 PM - 1 May 2014

*3D home tutorsㅿ*

April 18, 2015 ·

Q: Why do mathematicians like parks?

A: Because of all the natural logs.

*Yaar Kahin Aap Love Guru Toh Nahi*

May 22, 2015 ·

Q: Why do mathematicians like parks?

A: Because of all the natural logs

Math Puns Daily

@fey_karl

Q: Why do mathematicians like parks?

A: Because of all the natural logs.

10:14 AM - 17 Jan 2016

New York City • Buildings/Housing/Parks • Monday, February 08, 2016 • Permalink