The schools are shut, the universities closed, and the nation is in lockdown—what better time to publish a magazine? Save the date because we are publishing Chalkdust issue 11 at 9am on Friday 17 April. This issue includes all of your favourites like Dear Dirichlet, What’s hot and what’s not, and the crossnumber. There is also a smörgåsbord of articles to delight your mathematical senses, and of course terrible handcrafted maths puns, the like of which you can’t find anywhere else.

Due to current circumstances we will initially publish issue 11 online only: the articles will be available on the website, and (as usual) you will be able to read the whole magazine on issuu or download a PDF. We will be printing and distributing physical copies when circumstances allow. Continue reading →

Hello everyone! It’s time to announce the winners of the Chalkdust prize crossnumber #10! Before we reveal the winners, here is the solution of the crossnumber.

1

0

8

9

0

2

2

2

2

2

2

2

2

2

1

9

5

2

8

6

7

5

1

0

8

9

5

2

5

8

6

1

9

7

5

4

3

2

0

4

1

2

0

0

5

4

1

1

9

1

0

0

1

0

7

9

6

7

8

9

6

3

0

1

4

2

1

9

8

1

0

8

9

1

8

7

1

6

5

1

4

3

1

2

1

1

1

4

7

2

0

1

0

7

4

5

6

3

4

1

2

3

5

9

4

9

8

4

5

5

5

9

4

9

9

8

9

1

2

6

1

8

1

6

9

9

2

4

9

5

1

1

0

8

9

8

5

2

4

9

9

8

0

2

2

2

2

2

2

2

2

2

1

0

8

9

0

The sum of the across clues was 891873821817653.

There were 40 entries, 37 of which were correct. The randomly selected winners are:

Rollercoasters and railways were originally created without using curvature calculations. People on them would experience undesirable jerk (a sharp change in curvature results in jerk or centripetal forces). You may still experience this on old railways. The image below depicts a centrifugal railway that was constructed in 1846. Nowadays, rollercoaster and railway designers use a type of curve called a clothoid or Euler spiral to make the change in curvature less abrupt, for example when riding a loop-the-loop. I will later mention a couple of applications of Euler spirals. So curvature is clearly an important concept. Let’s get to grips with how it works, and where we should consider it. Continue reading →

A few weeks ago, we announced the 9 book shortlist for the 2019 Chalkdust Book of the Year. In this post, we announce the winner of this award.

We will be awarding two prizes: the Chalkdust Book of the Year (as chosen by our editors), and the Chalkdust Readers’ Choice (as voted for by our readers).

Chalkdust Book of the Year 2019

We found picking a winner of this award really difficult, as all the books on the shortlist were deserving of the prize (obviously, as if not they wouldn’t have made the shortlist). The one thing that set the winner apart from the other books was its appeal to both mathematicians and non-mathematicians. And the winner is:

The Maths of Life and Death

Kit Yates

This book (Amazon UK, Waterstones), as its title suggests, is all about the maths of life and death. It looks at the maths related to law, biology, medicine, the spread of diseases, and many more areas. Kit takes you through these areas with a series of interesting and well-written stories.

You can read our full review of The Maths of Life and Deathhere.

Chalkdust Readers’ Choice 2019

As well as picking our favourite from the shortlist, we held a vote for our readers to pick their favourite. The runaway winner of this poll was:

A Compendium Of Mathematical Methods: A handbook for school teachers

Jo Morgan

This book (Amazon UK, Waterstones, Foyles) contains details of various methods of completing various mathematical tasks, including subtraction, multiplication, simplifying surds, and polynomial division. Each method is demonstrated by example and reasons why each method works are discussed. This book is an excellent reference for secondary teachers, as well as an interesting book to browse through for the mathematically curious.

You can read our full review of A Compendium Of Mathematical Methodhere.

Michael Blastland is a writer and broadcaster, and was the creator of BBC Radio 4’s More or Less. His book The Hidden Half: How the World Conceals its Secrets (Amazon UK, Waterstones), looks at how to understand, and how to avoid misunderstanding statistics and research.

Style

This book is less of a maths book than many of the books on our shortlist, and much that is discussed relates to science in general. But, as More or Less fans might expect from its creator, an awful lot of its content is related to statistics and evidence; enough that we here at Chalkdust have deemed this a maths book.

In The Hidden Half, Michael Blastland takes the reader through statistical and numerical ideas that most often lead to confusion: relative and absolute risks, the difficulty of comparing now with the past, and the effect of hidden factors. He takes you through each idea with a series of stories illustrating the effect and importance of each idea.

Control

The book begins with a story about marmorkrebs: a species of crayfish that can reproduce asexually, leading to their offspring being clones. Even though both the nature (genes) and nurture (enviroment) of the offspring could be kept the same for each child, there were still surprising differences in the appearance, size, and even internal organs of these offspring. From the go, this story had me hooked, and was a great illustration of an extra hidden causal factor.

Damage

This book looks at problems of the misinterpretation of statistics from the point of view of a scientist or economist, giving the effects of this misinterpretation a very real feel.

Aggression

I really enjoyed this one, and would strongly recommend it to many of my friends, especially my more science-liking (and less maths-loving) friends who would find themselves enjoying this before really realising that the ideas they’re reading about are mathematical. This makes for a very enjoyable read for a mathematician who will not be familiar with the stories that Michael tells.

Now that we’ve review all the book’s on this year’s shortlist, you can vote for your favourite. The book with the highest number of votes will be crowned the 2019 Readers’ Choice. Voting closes at 5pm on Wednesday 26 February.

What is your favourite book on the 2019 Book of the Year shortlist?

A Compendium Of Mathematical Methods: A handbook for school teachers by Jo Morgan (48%, 37 Votes)

Geometry Puzzles in Felt Tip: A compilation of puzzles from 2018 by Catriona Shearer (18%, 14 Votes)

Humble Pi: A Comedy of Maths Errors by Matt Parker (16%, 12 Votes)

So You Think You’ve Got Problems? by Alex Bellos (5%, 4 Votes)

The Art of Logic by Eugenia Cheng (4%, 3 Votes)

The Hidden Half by Michael Blastland (3%, 2 Votes)

Maths on the Back of an Envelope by Rob Eastaway (3%, 2 Votes)

The Maths of Life and Death by Kit Yates (3%, 2 Votes)

Here Come the Numbers by Kyle D Evans and Hana Ayoob (1%, 1 Votes)

Maths on the Back on an Envelope is an easy-going and enjoyable read. It takes the reader through some methods of approximation of numbers, while showing the reader why being able to perform such approximations is a useful skill. As well as suggesting the use of approximation to check that the correctness of answers, or to work out the approximate size of answer that should be expected, the book also makes the very good point that often an approximation is the best that we can do, and giving answers to a greater-than-appropriate level of accuracy can be misleading.

Control

The book explains the methods of approximation in a very understandable manner, and also justifies their use and appropriateness. Throughout, the user is challenged to try out their newly found calculation skills; the solutions to these challenges are given the back of the book, alongside some discussion of some ways people go about answering them.

Damage

The discussion of estimation and accuracy in this book is very strong, and is not something I’ve read much about elsewhere. The book sets itself apart from other books by encouraging you to actively engage in tasks related to the material being discussed, and you may find yourself finishing it with a far greater understanding of what everyday numbers mean.

Aggression

Although many of the methods of mental or on-paper calculation discussed in this book will be familiar to the keen mathematician, this book is still an enjoyable read, and even the most capable calculator can benefit from thinking about the issues surrounding accuracy in this book. I’d most strongly recommend this book to those looking to improve their skills with numbers, or to improve their understanding of numbers around them an in the news, but there’s still plenty to enjoy here for others.

Kit Yates is a senior lecturer in the Department of Mathematical Sciences at the University of Bath, who works in mathematical biology. His first book, The Maths of Life and Death (Amazon UK, Waterstones), is all about the maths of life and death.

Style

The Maths of Life and Death takes the reader on a tour of seven important areas of mathematics that underpin life and death. Many of the ideas discussed are related to medical and biological applications of maths and stats, and included stories about when misunderstanding or misinterpreting numbers could have (and sometimes have had) very grave consequences.

Control

The maths in this book is well explained, and the application to real life issues both makes the maths more accessible to the less mathematical reader, and makes the book more interesting to the knowledgable mathematician who may be familiar with much of the maths but will be less familiar with the practical contexts where it can be applied.

Damage

The strongest sections of the book are those in which Kit discusses medical statistics and disease modelling. As his own research is based near these areas, he is able to draw on his personal knowledge of these areas, while maintaining reader-friendly explanations of the maths involved. There are many books about biology and medicine aimed at the general reader, but the maths involved in these pursuits is rarely presented to such an audience: this is this book’s biggest strength, and it sets it apart from many other maths books.

Aggression

I would recommend this book to those interested in maths, and those interested in medicine or biology as they will get a lot out of reading about the maths underlying much of the work in these areas. I have a few people in mind who might be getting this one next Christmas…

Humble Pi is a very entertaining read. Writing about mistakes, and the consequences of mistakes, allows Matt to include a number of amusing, and sometimes slightly frightening, anecdotes. These mistakes are used as an “excuse” to explain the underlying maths in an informative and engaging way.

Control

The mathematical ideas contained in this book are very clearly explained, and each one is attached to a real life mistake, making the importance of each bit of maths immediately clear.

Damage

As this book is about mistakes, and mistakes that have easily noticeable consequences make the best stories, the maths in this book is mostly that related to science and engineering. This means that the book spends time on topics that many maths books pass by, such as the resonance of bridges and financial maths. I enjoyed the financial maths section in particular, as this is an area that I don’t usually read about or spend much time thinking about.

Although readers may be aware of some of the the famous mistakes, such as the wobbly Millennium Bridge or Pac-Man breaking on the 256th level, there are many great stories here that readers will not be familiar with; and readers may well not know the true mathematical reasons behind the more famous stores.

Aggression

Overall, Humble Pi is both fun and interesting, and I would highly recommend it. I have in fact already given it to two friends as a present, and might be gifting it to more people this year now that the cheaper paperback is out.

So You Think You’ve Got Problems? contains 125 puzzles, plus a selection of shorter ‘teaser’ puzzles spread throughout the book. Between the puzzles, Alex tells us of the historical context of the puzzles, points out connections between puzzles, gives small hints, as well as discussing what makes a puzzles good.

Control

The book ends with answers to all the puzzles, including clear explanations of how these solutions can be found.

Damage

As anyone who follows his Guardian puzzle column will know, Alex has very good taste in puzzles. Unsurprisingly, therefore, this is a great collection of puzzles, and there is plenty in this book to keep you thinking for a long time. I do a lot of puzzles, and some of the puzzles in this book were similar to puzzles I’d seen before, but there were plenty that were not familiar to me and lots of new situations to think about.

Aggression

I’d recommend this book to anyone who like puzzles and can think of a few people who I could give this to next Christmas…

Here Come the Numbers is a rhyming picture book. Each page of Here Come the Numbers features rhymes about numbers alongside illustrations of the ideas involved. At first glance, it looks like a children’s book, and it starts as many children’s maths books start: with small positive integers. But unlike many children’s maths books, it doesn’t stop there.

Damage

Here Come the Numbers quickly goes beyond the topics contained in your usual learning-to-count book. It introduces the reader to prime numbers, with illustrations of rectangles of objects to show factorisations, before touching on Pythagorean triples, negative number, and even Fermat’s last theorem. It does this while maintaining the easy-to-read and child-friendly style.

In a few places in the book, the reader is encourage to think about something, for example which squares can be broken into two smaller squares. These prompts provide the reader with opportunities to investigate mathematical ideas themselves.

Control

The ideas in Here Come the Numbers are very clearly articulated, and the illustrations work really well alongside the text to make the ideas easy to visualise.

Aggression

I would strongly recommend this to parents of young children, and I am eagerly awaiting the day when my niece is old enough to read it with her.