# Hall of lame

And the wooden spoon goes to… us. Again.

We spend a lot of time trying to make each issue of Chalkdust perfect. But we wouldn’t be human if we didn’t make the odd error. Here’s our pick of the cock ups.

Do you have any more errata? Get in touch @chalkdustmag.

## Issue 01

A rare spot as it was fixed in the second printing of our first issue, a mix up of Einstein’s famous equations in an otherwise (inter)stellar article:

A tale of two Einstein equations: that $c^2$ should be $c^4$, unless we were using $c$ to represent the square of the speed of light…

## Issue 02

A howler on the cover: did you see this?

How has the white of the ‘k’ appeared above the grey?

Did you have a go at our Issue 02 crossnumber? It’s still available to play, and we’ve fixed this little mistake:

Crossnumber enthusiasts might have noticed that 4 Down doesn’t actually quite work

One of our favourite functions was the Weierstrass function: continuous everywhere but differentiable nowhere (basically very spiky). But did you spot that there’s a typo in the definition?

That should be $ab > 1+\frac{3}{2}\pi$.

## Issue 03

Welcome to Issue 03! Here’s a lovely pixelly picture of our interviewee, Ian Stewart.

Lovely pixelly Ian Stewart. Stay away from PNG files!

You might have been distracted by this extraneous space in our Page 3 model:

‘that’, space, comma?!

## Issue 04

In our article on the Buckingham pi theorem, we made this explosive error:

John von Nuemann, you say? Any relation to John von Neumann?

## Issue 05

Our history column, Roots, is written by the brilliant Emma Bell. But let’s hope you don’t need to get in touch with her!

Not technically the right email address, emmalbell@outlook.com

That $b$ and $-b$? Should $b$ the other way round

Next issue, Top 10 basic geometric errors:

Fans of primary school maths will know that the radius is half the diameter, not the circumference

## Issue 06

Electromagnetic Field is hot, but it is not spelled like that.

e

According to issue 06’s Top ten geometry instruments, a theolodite (sic) is a surveyors (sic) favourite tool.

That should of course say “theodolite” and “surveyor’s”

## Issue 08

In Colin Beveridge’s article about Truchet tiles, we made a extremely silly grammatical error.

A easy mistake to make

• ### Chalkdust issue 10 – Coming 24 October

Come along to our launch party for free pizza and the real quiz
• ### Talkdust, episode 4

A podcast for the mathematically curious
• ### Read Issue 09 now!

Ride a phantom parabola into our latest issue. Billiards, maths, tiles, mistakes, plus all your favourite regulars.
• ### Dear Dirichlet, Issue 09

Coffee, Brexit and badgers are among the topics of discussion in this issue's Dear Dirichlet advice column
• ### Horoscope, Issue 09

Mystic mug has some predictions for you...
• ### Top Ten: Chalkdust regulars

The definitive chart of the best Chalkdust regulars