Math Forum / Mathematics / Recreational Math / April 2005

If one wants to tell a joke, he'd do it with a smiley.
For example,
    There aren't any mathematical jokes. ;-)
Now if one wants to tell a joke with a straight face, that is easy.

What is the null joke?

I recall seeing this problem used as a means of testing software that does
Mathematical deductions. I though it might also make for an entertaining
recreational algebra problem.
We have a set U with a binary operation #. It is not known if # is

For example:
   What's A, B, and Cs Ds?
-
-

It has been a very long time since I attempted any form of math (just post
stone tablet era, I think).
I ask for your help on the following:
I would like to accurately express the portion of the electro magnetic

I was wrong about the lack of math jokes.
1. Go to Google and click on Groups.
2.To the right of the "Search Groups" button click on the link to "Advanced
Groups Search".

These recreational problems/puzzles require one to convert a grid of
integers into a different grid of integers ("the goal") using a simple
process:
1. Select two orthogonally adjacent cells in the grid.

X uniform distributed on the interval [0,1]
Y uniform distributed on the interval [0,2]
Z uniform distributed on the interval [0,3]
What is the probability density function of X+Y+Z

When the radius and the arc lenght are given, how can the chord length be
calculated ?
Thanks.

The Null Club is an extremely exclusive membership only, social
organization.  As acceptance into this club grants upon it's members the
ability to be and to do anything, membership is highly sought after.
Upon the complaints of politicians and CEO's, that membership was being

I mean the question was put to me by a 10 year old.
You are given four arbitrary digits on pieces of card. What is the
strategy for making the product of two pairs as large as possible?
First of all I thought that one should make the two numbers as close

Hello, helpful people,
On April 22, 2005, the Dilbert comic strip contained what I think is a
monumental math error, but I'm not sure.
And even if I am right I'm not sure how large that error is.

I spend a lot of time focusing on explaining my mathematical research
in ever simpler ways with the idea that if I can put out the
information in an easy to check format, then some people are going to
realize I'm correct.

I've also completely rewritten the CellLife program on my website (
http://www.btinternet.com/~tony.tooth/ )

Picture two Cylinders of radius r that intersect at right angles.
The volume common to both cylinders is a funny looking shape that
is round in cross section in two directions and square in the third.
It will smoothly roll in two orthogonal directions.