A short update from Katie and Peter.

]]>A conversation about mathematics inspired by an old textbook, *Mathematics in Theory and Practice*, edited by Warwick Sawyer. Presented by Katie Steckles and Peter Rowlett.

A conversation about mathematics inspired by a scone. Presented by Katie Steckles and Peter Rowlett, with special guest Sophie Maclean.

]]>A conversation about mathematics inspired by the Joukowsky aerofoil. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a guitar. Presented by Katie Steckles and Peter Rowlett, with special guest Sam Hartburn.

]]>A conversation about mathematics inspired by a 1960s game designed to teach set theory. Presented by Katie Steckles and Peter Rowlett.

On-Sets: A Vintage Set Theory Game by Peter Rowlett is free to read in *Math Horizons*.

A conversation about mathematics and literature inspired by a book. Presented by Katie Steckles and Peter Rowlett with special guest Sarah Hart, author of *Once Upon a Prime: The Wondrous Connections Between Mathematics and Literature*.

A conversation about mathematics inspired by a Battenberg cake. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by the new aperiodic monotile. Presented by Katie Steckles and Peter Rowlett, with special guest Chaim Goodman-Strauss.

The paper announcing the discovery is An aperiodic monotile by David Smith, Joseph Samuel Myers, Craig S. Kaplan and Chaim Goodman-Strauss.

Chaim was recording from MoMath in New York, which will be running a creative artwork competition based on the monotile with UKMT. Chaim also mentioned a meeting in Oxford: Hatfest: celebrating the discovery of an Aperiodic Monotile.

Note: This podcast was recorded after the discovery of the ‘hat’ and ‘turtle’ monotiles but before the announcement of the ‘spectre’ monotile. Confused? Don’t worry, we explain in the episode!

]]>A conversation about mathematics inspired by some fingers. Presented by Katie Steckles and Peter Rowlett, with special guest Ben Orlin. Ben’s new book is Math Games with Bad Drawings.

]]>A conversation about mathematics inspired by the game Quarto. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a slinky. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by the nodal cubic. Presented by Katie Steckles and Peter Rowlett. We go closer to the cutting edge of research than usual in this chat with Angela Tabiri about her PhD research.

]]>A conversation about mathematics inspired by the PageRank algorithm. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a joke. Presented by Katie Steckles and Peter Rowlett, with special guest Bec Hill.

]]>A conversation about mathematics inspired by a hairy ball. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a superegg. Presented by Katie Steckles and Peter Rowlett, with special guest Hannah Fry.

]]>A conversation about mathematical jokes, humour and folklore inspired by a sheep, at least one side of which is black. Presented by Katie Steckles and Peter Rowlett.

The jokes sent to Peter on Twitter that we mention can be found in the replies to this tweet.

]]>A conversation about mathematics inspired by a plate of biscuits. Presented by Katie Steckles and Peter Rowlett, with special guest Alison Kiddle. What do you notice? What do you wonder?

Alison’s Noticing and wondering page.

We also mentioned A Problem Squared Episode 014 = Final Cheese Drama and Quick-Fire-O-Rama.

]]>A conversation about mathematics inspired by a Spirograph set. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a balancing bird. Presented by Katie Steckles and Peter Rowlett, with special guest Alom Shaha.

]]>A conversation about mathematics inspired by UUID 0412a969-5b27-4c28-9662-85ef2c201e0c. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by an auctioneer’s hammer. Presented by Katie Steckles and Peter Rowlett, with special guest Tim Harford.

]]>A conversation about mathematics inspired by cards from the game Dobble. Presented by Katie Steckles and Peter Rowlett. You can read more about Katie’s adventures in golfing combinatorics.

]]>A conversation about mathematics inspired by an arbelos. Presented by Katie Steckles and Peter Rowlett, with special guest Catriona Agg.

Catriona mentions this proof without words, which is taken from Proof Without Words: The Area of an Arbelos by Roger B. Nelsen in *Mathematics Magazine*.

A conversation about mathematics inspired by a box of Christmas crackers. Presented by Katie Steckles and Peter Rowlett. Merry Christmas!

]]>A conversation about mathematics inspired by an Enigma machine. Presented by Katie Steckles and Peter Rowlett, with special guest Tom Briggs.

]]>A conversation about mathematics inspired by some solids of constant width. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a ball of wool (yarn). Presented by Katie Steckles and Peter Rowlett, with special guest Pat Ashforth.

]]>A conversation about mathematics inspired by a lottery machine. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a Klein bottle and Mathsteroids. Presented by Katie Steckles and Peter Rowlett, with special guest Matthew Scroggs.

]]>A conversation about mathematics inspired by a hat. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics and education inspired by a hundred square. Presented by Katie Steckles and Peter Rowlett, with special guest Susan Okereke.

In the episode, we mentioned the original Prime Climb colouring sheet and Peter’s Prime Climb colouring sheet on GitHub as drawing-primes.

]]>A conversation about mathematics inspired by a Twenty Pence coin. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a vehicle. Presented by Katie Steckles and Peter Rowlett, with special guest Christopher Danielson.

]]>A conversation about mathematics inspired by a Möbius band. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a mandala. Presented by Katie Steckles and Peter Rowlett, with special guest Hana Ayoob.

]]>A conversation about mathematics inspired by acoustic mirrors. Presented by Katie Steckles and Peter Rowlett, with special guest James Grime.

Image: WW1 Acoustic Mirror, Kilnsea; cc-by-sa/2.0 – © Paul Glazzard. ]]>A conversation about mathematics inspired by number block cubes/snap cubes. Presented by Katie Steckles and Peter Rowlett.

Peter’s blog post: Mathematical play with young children.

Mike Lawler’s three-tweet thread of more advanced ideas starts here:

]]>A conversation about mathematics inspired by a Rubik’s Cube. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a set of D&D dice. Presented by Katie Steckles and Peter Rowlett.

]]>Katie and Peter give a little update on the podcast, life in lockdown and the upcoming season/series 3.

]]>A conversation about combinatorics, the mathematics of counting, inspired by a robot caterpillar. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about the mathematics of chemistry inspired by a pencil, plus a chat about approximation. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics including fractals inspired by a Romanesco Broccoli. Presented by Katie Steckles and Peter Rowlett, idea suggested by John Read (thanks John!).

]]>A conversation about mathematics inspired by a deck of Set cards. Presented by Katie Steckles and Peter Rowlett.

We mentioned an implementation of Set in Python by Ben Nuttall and a retro NES version by Katie.

]]>A conversation about mathematics inspired by the game Ox Blocks. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a Correntator, a mechanical adding machine. Presented by Katie Steckles and Peter Rowlett, with special guest Christian Lawson-Perfect.

]]>A conversation about mathematics inspired by the pseudorhombicuboctahedron. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a pair of skipping ropes. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a thermometer. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a Noughts and Crosses (Tic Tac Toe) board, covering Noughts and Crosses, a surprising number of variants, with a bit of higher dimensions and topology for good measure. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a tangerine (no, really!). Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a pile of matchsticks. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a set of Tantrix tiles, a beaded necklace and some juggling balls. Presented by Katie Steckles and Peter Rowlett, with special guest Alex Corner.

]]>A conversation about mathematics inspired by a stick of chalk. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by a t-shirt featuring Pythagoras’ theorem. Presented by Katie Steckles and Peter Rowlett.

]]>A conversation about mathematics inspired by the Towers of Hanoi puzzle. Presented by Katie Steckles and Peter Rowlett.

Update: Here’s a lovely knitted Towers of Hanoi, tweeted in response to this episode by Pat Ashforth.

]]>Presented by Katie Steckles and Peter Rowlett, episodes of Mathematical Objects will take an object, real or abstract, as inspiration to chat about a mathematical topic. This introduction explains the idea ahead of the first episode, coming soon.

]]>Cushing was injured in a serious maths accident recently (he fell out of the bath) so I wanted to assess the damage to his number-wrangling faculties.

Fortunately, there’s the National Numeracy Challenge, which begins with a test to pinpoint your weak areas. National Numeracy is a charity that wants every adult in the UK to “reach a level of numeracy skills that allow them to meet their full potential.” Well, if there’s one thing we’ve got, it’s bags of potential.

So I called David up and we took the test together. Because I had my fears about how it might go, I recorded our conversation. You can listen to that below. You’ll probably get the most out of it if you follow along with the test yourself, by going to nnchallenge.org.uk and signing up. It only takes a minute!

**WARNING: Spoilers ahead**

We got to Level 2! And it turns out it did give us certificates!

Take the National Numeracy Challenge (or, since you’re reading this site, share that link with your relatives)

]]>Here are some links to the things we talked about:

MathsJam website

MathsJam conference website

@MathsJam, on Twitter

MathsJam Bake-off entries, 2013

Matt’s maths mug

David and I sat down again and talked about maths a bit more. I’m calling this number 1 because it suits both our counting systems: David can call this the first podcast of a new series, and I can say the one we put out under *All Squared* was number 0. Everyone wins!

Here follows a long rambly list of things we talked about, and some things we alluded to too. The button to actually play the podcast is down at the bottom of the post.

- Algebraic combinatorial geometry: the polynomial method in arithmetic combinatorics, incidence combinatorics, and number theory
- The probabilistic method
- Swiss cheeses, rational approximations and universal plane curves (The one with the excellent bibliography)
- A cheaper Swiss cheese
- Alice in Switzerland: The life and mathematics of Alice Roth
- Meromorphic function
- Carrots for dessert
- Orange peels and Fresnel integrals
- Cake Cutting Mechanisms
- The University of Auckland has lots of kiwis in its logo. Newcastle University only has one lion.

- Computer analysis of Sprouts with nimbers
- Nimbers
- On Numbers and Games
- How to eat 4/9 of a pizza
- On the Cookie Monster Problem
- 100 Essential Things You Didn’t Know You Didn’t Know
- Garfield’s proof of the Pythagorean theorem
- Napoleon’s theorem
- Arithmetic derivative
- David really does have a big tattoo of $\pi$ on his chest.
- Tukey tallying
- There exist infinitely many twin primes iff there are infinitely many primes $p$ such that $(p^2)^{\prime\prime\prime} = 1$.
- The Princeton Companion to Mathematics (warning: auto-playing “podcast”)
- A CBE is not quite as worthy as a Knight or a Dame
- The book with the pictures of nudey ladies is
*Groupes Stables*, by Bruno Poizat. The French edition with the pictures is very hard to get hold of (we had to do an inter-library loan through the university), but the foreword to the English translation is superb, and basically boils down to “je ne regrette rien”. - The proof that $\sqrt[n+2]{2}$ is irrational because of Fermat’s Last Theorem, which was retold at MathsJam by Julia Collins.
- That came from the MathOverflow question, “Awfully sophisticated proof for simple facts”.
- Congruent number
- Matrix determinant fact
- Determinants and Matrices by A.C. Aitken (possibly shonky PDF copy)
- Pfaffian
- The 15 stupid proofs that the primes are infinite were published in the latest issue of
*Paradox*(PDF), the magazine of the Melbourne University maths and stats society. They’re on page 17.

Actually, we ended up talking about the MathsJam baking competition for absolutely ages. When we got round to talking about the site, we mentioned:

]]>Here are some links to go with the things we talked about:

- AAAS Mass Media Fellowship
- Evelyn Lamb.
- Evelyn on Twitter.
- Roots of Unity, Evelyn’s blog at Scientific American.
- The AMS Blog on Maths Blogs, edited by Evelyn Lamb and Brie Finegold.
- Solved? 80-year-old puzzle of the infinite sphere,
*New Scientist*‘s coverage of last year’s invariant subspace ‘proof’. - Adam Goucher’s blog, Complex Projective 4-Space.
- Evelyn’s Carnival of Maths post.

We talked for about an hour and a half, but because I’m completely stupid we lost a big chunk of it when the microphone switched off. To make things even worse, we recorded in a room with a ridiculously loud fan, so there’s that to contend with. Anyway, we talked about some fun stuff, so I think it’s worth listening to.

Here are some links relevant to the things we talked about.

- David would like you to know that $5 \times 16017 = 80085$.
- The book David brought was
*Topology*, by James Munkres. - Brouwer’s fixed-point theorem says that for any continuous function $f$ with certain properties mapping a compact convex set into itself there is a point $x_0$ such that $f(x_0) = x_0$.
- The pancake theorem is referred to by MathWorld as “a two-dimensional version of the ham sandwich theorem”, so CP wins. The ham sandwich theorem says that the volumes of any $n$ $n$-dimensional solids can be simultaneously bisected by an $(n-1)$-dimensional hyperplane.
- The hairy ball theorem says that there is no nonvanishing continuous tangent vector field on even-dimensional $n$-spheres – there’s always a point on the sphere where the function is zero.
- The black hole information paradox says that it’s possible for a black hole to destroy information. In 2004 Stephen Hawking conceded his bet that information is destroyed, so CP wins again. (Guess who’s writing this summary)
- The book CP brought was
*Only Problems, Not Solutions*by Florentin Smarandache. It turns out he’s a bit of a character! - The family of sequences which contains a sequence for each digit, except inexplicably 1, was “Primes with $n$ consecutive digits beginning with the digit $D$”
- Problem 102 of
*Only Problems…*contained this cool diagram: - We can’t remember what “the Russian book” was. Sorry!
- The powerful numbers are sequence A060355 in the OEIS.
- Paul Erdős made a conjecture on arithmetic progressions.
- The Bee Gees consisted of brothers Barry, Robin, and Maurice Gibb. That’s three people: a powerful triple.
- $x^2 – 8y^2 = 1$ is a Pell equation, and the reason why the continued fraction representation of $\sqrt{8}$ generates consecutive pairs of powerful numbers.
- The Muddy Children puzzle is a good introduction to public announcement logic. The slides we were looking at were “The Muddy Children: a logic for public announcement”, by Jesse Hughes.
- Analysis vs Algebra predicts eating corn?
- David was playing Wuzzit Trouble by InnerTube Games. It was reviewed here by Colin Beveridge last month.

This is the second and final part of our interview with Colm Mulcahy. Last week we talked about card magic; in this part we moved on to the subject of Martin Gardner and the gatherings of interesting people associated with his name.

We’ve tacked on some blather we recorded about the British Science Festival in Newcastle to the end of this podcast. Listen in to hear what we think about maths! (We’re broadly in favour of it.)

Here are some links to go with the things we talked about:

- Martin’s autobiography,
*Undiluted Hocus Pocus*, came out last month. Here’s a review in Plus Magazine. - Mathematics Awareness Month in 2014 will be on the theme of “Magic, Mystery and Mathematics”, to celebrate Martin Gardner’s centenary.
- The Gathering 4 Gardner happens every two years. The next one is in 2014, but it’s invitation only!
- Celebrations of Mind happen all round the world to carry on the Gardnerian spirit. You can look at a map of all the events and register your own at the official site.

Colm’s book *Mathematical Card Magic: Fifty-Two New Effects* is published by CRC Press, priced £19.99/$29.95 and available from the booksellers in general.

Colm Mulcahy is an original Aperiodical contributor (Aperiodicontributor?) and friend of the site. He’s spent the last year and a bit writing his new book, *Mathematical Card Magic: Fifty-Two New Effects*. It came out a few weeks ago, so we thought it was a good opportunity to talk to him and find out just what’s so great about mathematical magic tricks.

Actually, we had that thought quite a while ago and if we’d been the least bit organised this podcast would’ve come out the same day as the book. As it happened, we first arranged to talk to Colm back in May, and then it took literally three months before we actually managed to record the interview.

… And then it took us three weeks to edit it up and upload it. Sorry!

Because Colm had so much interesting stuff to say, we’ve split the interview into two parts. In this first half we talk about the book and mathematical card magic; in the second part, out next week, we talk about Martin Gardner and the Celebration of Mind.

*Mathematical Card Magic: Fifty-Two New Effects* is published by CRC Press, priced £19.99/$29.95.

This number of the All Squared podcast contains the final third of our interview with the inestimable David Singmaster, and then a bit from CP about his favourite book, “*A treatise on practical arithmetic, with book-keeping by single entry*“, by William Tinwell.

The first part of the interview, and plenty of links to go with it, were in Number 5 of the podcast.

Here are some links to the things we referred to in this podcast:

- The Casa di Galileo.
- The Internet Archive has scanned in Dickson’s
*History of the Theory of Numbers*(and Volume 2 and Volume 3). - David’s notes are written in the SCRIPT markup language. If you know anything about it and have an idea of how to put it on the web, please get in touch.
- The Internet Archive also has a scanned-in copy of the fifth edition of Christian’s favourite book,
*A Treatise of Practical Arithmetic*(the “of” seems to have changed to “on” for the sixth edition). - Tynemouth Market.
- The MathsJam annual conference is attended by not just David, Katie and CP, but a whole load of people who are really passionate about recreational maths in all its forms. Registration for the 2013 meeting has just opened – you know what to do!

Finally, here are some pictures of Christian’s favourite book, so you don’t just have to imagine what he was talking about:

We hope you enjoy listening to this two-parter. We certainly enjoyed recording it!

]]>Good maths books are simultaneously plentiful and rare. While there are a few classics almost everyone knows about and has copies of (Gardner, Hardy, etc.), the trade in lesser-known maths books is considerably less well-organised. Very few bookshops have well-stocked maths sections, and insipid pop maths books dominate. Unless you hear about a good maths book through word of mouth, you’ll often only encounter it once it’s ended up in a second-hand bookshop, usually a refugee from an emptied maths department library.

But books, more than anything else, are where the beauty of maths really manifests itself. It’s where ideas are presented most clearly, after they’ve had time to percolate through a few more brains. We talked to David Singmaster, professor of maths and metagrobologist, about his favourite maths books.

Here are some links to the things we referred to in the podcast, along with some bonus extras:

- The Slocum Puzzle Collection at Indiana University
- Luca Pacioli on Wikipedia
- Scans of the manuscript of
*De Viribus Quantitatis* - The Conjuring Arts Research Center’s edition of
*De Viribus Quantitatis* - The one pile game (Static Nim)
- Nim on Wikipedia
- Nimber on Wikipedia
*Nim Multiplication*by Lenstra (link goes to a big PDF)- The game that wasn’t solved was Sprouts, which is analysed using nimbers in
*Computer analysis of Sprouts with nimbers*by Lemoine and Viennot *Winning Ways for your Mathematical Plays*by Berlekamp, Conway and Guy*Melancholia*by Albrecht Dürer at the British Museum (it’s also the icon for our Arty Maths section over there on the right!)*The Blind Abbess and her Nuns*at The Puzzle Museum- The vertical-horizontal illusion at Wikipedia
- George Hart’s page on
*De Divina Proportione (*and one on Leonardo da Vinci’s illustrations) - Scans of
*De**Divina Proportione*at archive.org - The drawings CP was thinking of were from the Codex Guelf, and posted at BibliOdyssey.
- Between 1981 and 1985 David edited and published
*Cubic Circular*. With David’s permission, Jaap Scherphuis has put every issue online.

CP recommends Westwood Books in Sedbergh and Barter Books in Alnwick as sources of unusual second-hand maths books. The chap who runs Westwood is an ex-mathematician and does a good job of saving books being thrown out of university libraries.

Part 2 will appear next week.

]]>Here are some links to the things we referred to in the podcast, along with some bonus extras:

- The operator precedence problem that makes Katie want to cry
- Colin Wright has blogged about it
- Chocolate maths!
- Robert Munafo’s
*Notable properties of specific numbers* - The Online Encyclopedia of Integer Sequences
- A135650 – Even perfect numbers written in base 2
- A002904 – Delete all letters except c,d,i,l,m,v,x from n then read as Roman numeral if possible, otherwise 0
- A000012 – The simplest sequence of positive numbers: the all 1’s sequence.
- The episode of
*Relatively Prime*about interesting number facts, including the OEIS.

Matt Parker plugged a couple of things:

Next time, which should be soon, we’ll be talking to a Fantastic Mystery Guest about our favourite maths books.

]]>Remember, remember,

The fourteenth of March.

While the previous number of *All Squared* failed to achieve topicality by appearing several weeks after the event it was about, this time we’ve hit the nail bang on the head with a podcast all about π day… *on π day!*

We chatted to Festival of the Spoken Nerd’s Steve Mould about remembering π – how much can you memorise; how much *should* you memorise; and if you really insist on memorising it, what’s the best way to do it?

Here are some links to the things we referred to in the podcast, along with some bonus extras:

- The number of this episode is 3, which is exactly π if you don’t think very hard when you read the Bible
- A chronology of the computation of π
- Epic π quest sets 10 trillion digit record, at
*New Scientist* - Download 4 million digits of π
- “Using pi calculated out to only 39 decimal places would allow one to compute the circumference of the entire universe to the accuracy of less than the diameter of a hydrogen atom.“
- The π Code – π in base 26 ≈ D.DRSQLOL
- 33,333 digits of π in base-(the 1000 most common words in the English language)
- Japanese breaks pi memory record on BBC News (in which “Conventionally, 3.14159 is used as pi.”)
- Japanese man claims new record for memorising ‘pi’ at the Daily Mail (in which “It is usually written out to a maximum of three decimal places, as 3.141, in math textbooks.”)
- Akira Haraguchi
- The official world record for memorising π is held by Chao Lu of China, who memorised 67,890 decimal digits.
- Kolmogorov complexity (Steve had the definition right – it measures just the length of the
*description*of the thing, and doesn’t measure the resources required to interpret that description) - Normal number
- Find your birthday in π
- Find any string of digits in π
- Michael Hogg’s method of memorising 100 digits of π
- Joshua Foer: Moonwalking with Einstein – a talk about a book about memory
- Irrational sonnets (where the stanzas have 3,1,4,1,5 lines) in French, or in English
- A mnemonic for π which is also a pangram, in French
- Previously on The Aperiodical: Random walks on π, a marvellous visualisation of the digits of π.
- Circular reasoning: who first proved that $C/d$ is a constant? – a historical essay by David Richeson.
- While Steve was chatting to us, his collaborator Matt Parker was measuring π with pies for
*Numberphile*.

Steve Mould has his fingers in, if you’ll excuse one final pun, many pies. Here are some links to some of his projects you might find interesting:

]]>Here are some links to the things we referred to, along with some further reading. Since we found so many nonsense formula stories, I’ll split the links into two sections: nonsense and the rest.

- Flipping clever! Formula for the perfect pancake revealed by maths boffins (but we’ll still end up with ours stuck to the ceiling) – Daily Mail (2013)
- The perfect pancake? Easy, just follow this formula … 100 – [10L – 7F + C(k – C) + T(m – T)]/(S – E) – Daily Mail (2009); the one with the amazing stock photo
- Formula for perfect pancake unveiled by scientists – The Telegraph (2009)
- How to toss the perfect pancake – Daily Express; the one without the actual formula
- The perfect pancake toss – Shortlist; includes the formula
- Why today’s the perfect day to change your life – Daily Mail
- Revealed: The formula for a perfect family Christmas – drink two parts wine for every three chocolates – Daily Mail
- Scientists are serious about having a laugh – The Telegraph
- Scientists reveal formula for the perfect sitcom – The Telegraph
- Horror’s perfect formula – London Evening Standard; the one where “blood and guts” = $\sin x$.
- Here’s my happy marriage secret: avoid romance – The Telegraph
- The formula for perfect parking – NPR

- The geometry of perfect parking – Simon Blackburn; PDF
- The Tommy Westphall universe
- Jewish Problems – Tanya Khovanova’s collection of Russian “coffin” problems on the arXiv, including number 1’s quickly-read puzzle.
- Mathematical Puzzles, a Connoisseur’s Collection, by Peter Winkler
- The Muddy Children: a logic for public announcement – slides by Jesse Hughes
- CP’s Interesting Esoterica collection

Number 3 will appear in exactly 9 days. You can probably guess what it’ll be about. But can you guess who we’ll be talking to?

You can subscribe to *All Squared* through our RSS feed. We’ll set up an iTunes thing if anyone asks for it.

This is the first number of the podcast (we thought ‘episode’ would set unrealistic expectations of regularity, and we can never resist a pun). It includes an interview with Edmund Harriss about spoken mathematics, as well as a puzzle which we’ll give the answer to in the next number, and a great mathematical flash game to keep you occupied until that appears.

Here are some links to the things we referred to, along with some further reading:

- Mathematics Out Loud at Maxwell’s Demon, Edmund’s blog
- Milton’s
*Paradise Lost*(Project Gutenberg ebook version) *The Pythagorean Proposition*, a book containing nearly 370 proofs- The proof of Pythagoras’ theorem that Katie gave
- Pythagorean Theorem poem
- Maths Poetry at Mr P’s Maths Page
- Gunfight at the cubic corral – Thony Christie on Cardano, Tartaglia and 16th Century maths competitions
- The same topic at
*The Story of Mathematics* - CP’s proof without words on YouTube
- Edmund says
*Sphere Packings, Lattices and Groups*by John Conway is particularly readable. - Z-Rox, the dimensionally deficient game, at Kongregate

Number 2 (or should it be 4?) will appear soon*ish*.

In this episode we talked about:

- Our piece on the Invariant Subspace Problem (and the more recent news)
- Log-log! Who’s there? Not a power law!
- Our coverage of the new Mersenne Prime news, and our meta-coverage of everyone else’s coverage of it
- The good, the bad, and Gowers
- Interesting comments discussion on the ‘What is a mathematician’ post
- The first in Katie’s series of Open Season posts, on Singmaster’s Conjecture
- Please consider hosting the Carnival of Mathematics
*Mysterious upcoming project*– watch this space

As always, we’re keen to hear about your mathematical exploits either by email to root@aperiodical.com or through our new, streamlined sending-something-in form.

]]>In this episode, we talked about:

- Mathematical Christmas cracker jokes
- Fractal Christmas trees
- Posts from MathsJam speakers – Tom Button on Radii of Polyhedra and Phil Harvey on AS Results and Batting Averages
- The Aperiodical’s Mathematical Survey
- Carnival of Mathematics 94

As always, we’re keen to hear about your mathematical exploits either by email to root@aperiodical.com or through our new, streamlined sending-something-in form.

If you’ve got some ideas for how we can do a better podcast, we’d be particularly keen to hear from you.

]]>We talked about:

- Christian’s Recreational Maths Seminar
- Dara O Briain: School of Hard Sums to return; maths students sought to take part
- Matt Parker’s Twitter Puzzle – 12th Nov
- John McKenna’s helpful comment about our title font

As always, we’re keen to hear about your mathematical exploits either by email at root@aperiodical.com, our twitter @aperiodical, or whatever means you can think of to get in contact with us.

]]>This time, we talked about:

- Advances in pure nonsense
- Robert Schneider, Mathematical Musician/Musical Mathematician
- #MTT2K: Teachers critique Khan Academy
- Surds: what are they good for?
- Calculus of the Nervous System
- The new fonts on the site
- Christian’s new Aperiodical Round Up and Interesting Esoterica Summation
- Puzzlebomb October 2012

Christian apologises for the poor sound quality, an unavoidable consequence of being at the family home for the weekend without a proper microphone.

As always, we’re keen to hear about your mathematical exploits either by email at root@aperiodical.com, our twitter @aperiodical, or whatever means you can think of to get in contact with us.

]]>In this episode Peter and Christian were enjoying the comforts of their respective homes, while Katie was preparing to be sawn in half by a crazed Matt Parker at the British Science Festival. We talked about:

- Bill Thurston has died
- A glider on an aperiodic cellular automaton exists! (and the alternative glider Tim Hutton posted on Google+)
- Knitty spiked icosahedron
- Puzzlebomb – September 2012
- Matt Parker needs help building a domino computer

As always, we’re keen to hear about your mathematical exploits at root@aperiodical.com, and you still have eight days to submit items for the 90th Carnival of Mathematics, which you can do through our form.

]]>The posts discussed in this episode were:

- Telegraph’s open letter to Michael Gove and Vince Cable on numeracy (presented with arithmetic errors), by Peter
- More and Less, by Paul Taylor
- Interesting Esoterica Summation volume 4, by Christian
- Turing Round Up
- Open Access Round Up
- MathsJam Annual Conference 2012 booking now open
- An answer to what Shouryya Ray’s ‘unsolved Newton problem’ was
- π vs τ: FOTSN/Tau Day special by Steve Mould and Matt Parker
- Carnival of Mathematics 88
- Dance Your PhD: Cutting Sequences on the Double Pentagon by Katie

You have three days to submit posts for the next Carnival of Maths, hosted here by Katie.

]]>Ask a mathematician: “Where should we live?” by Alistair Bird

The mathematics examinations faced by school leavers in the Republic of Ireland by Colm Mulcahy

P-Value Extravaganza posted by Christian

The Super Subtraction Feat by Colin Beveridge

Has schoolboy genius solved problems that baffled mathematicians for centuries? by Christian and Peter

The Table Never Lies by Mr. Gregg

Puzzlebomb – June 2012 by Katie

In what flipping dimension is a square peg in a round hole just as good as a round peg in a square hole? by Card Colm

The strange case of Misha Verbitsky and the trademarked beard by Christian

P-p-p-publicise a paper! by Christian and Nathan

Aperiodical Round Up 6 – It glides to a stop as it reaches the end of the power stroke by Christian

Open Access Update – 25th of May by Christian

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