The Aperiodical

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Occasional(ly) mathematical blogging

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Last post: Sep 16, 2026
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Double Maths First Thing: Issue 6A
Sep 16, 2026 · original
Double Maths First Thing is changing the key right back again. Hello! My name is Colin and I am a mathematician on a mission to spread the joy and love of maths as far and wide as I can. I’m fresh(ish) from extending my comfort zone by stepping in at short notice to play a full-on two-hour set at my local alcohol-free pub – I hadn’t done a proper solo gig in more than 20 years, and (while there was still a bit of rust) everyone seemed happy enough. And it’s given me a burst of bonus confidence for Monday coming (September 21st), when the Pseudorandom Ensemble play MathsWorld in Southwark . We’ve got a cracking set lined up, and we hope to see you there! Links In “niches I didn’t realise needed filling”, here’s Ayliean reading her first sleepy STEM story (and also it’s raining) . You should subscribe to her channel. Matt Zucker is running a course on fabricating tessellations and tilings
Double Maths First Thing: Issue 69
Sep 9, 2026 · original
It’s Double Maths First Thing, not Double Entendre. Hello! My name is Colin and I am a mathematician on a mission to spread joy and delight in maths and mathematical thinking. Something that’s been brewing for a while: I’ve come to the decision that DMFT will no longer report on AI-related topics. I’m not judging anyone for being interested in them, or even finding joy in them; I’ve just reached a point where I find the whole thing tiresome, and more than adequately covered elsewhere. As you were. Links Maps! I like maps. The UN has just adopted a “new” world map , using the Equal Earth projection . This has inspired me to finally pick up Paulina Rowińska’s Mapmatics , which has been on my to-read list for years. Meanwhile, here’s a blog about spurious accuracy in latitude and longitudes . Art! I like art. Fractal Kitty is encouraging people to paint the OEIS . Estimation! I like estimat
Carnival of Maths 254
Sep 8, 2026 · original
The next issue of the Carnival of Mathematics, rounding up blog posts from the month of August 2026, is now online courtesy of Karen Campe at Reflections and Tangents . The Carnival rounds up maths blog posts from all over the internet, including some from our own Aperiodical. See our Carnival of Mathematics page for more information.
\(-e^{i\pi}\) to Watch: aboutlogic
Sep 7, 2026 · original
In this series of posts, we’ll be featuring mathematical video and streaming channels from all over the internet, by speaking to the creators of the channel and asking them about what they do. We spoke to Deniz & Thorsten, who host the aboutlogic channel. Channel title : aboutlogic Link : youtube.com/@aboutlogic Topics covered: Philosophy, logic, and mathematics Average video length : 30-90 minutes Recommended videos : Emily Riehl , Joel Hamkins What is your channel about, and when/why did it start? aboutlogic is a podcast on logic, foundations of mathematics, philosophy, and theoretical computer science. It features in-depth conversations with people working in and around the foundations of these subjects. We talk about topics ranging from the foundations of computer science and set theory to critical thinking, puzzles, and what academic life is really like. Its motivations, frustration
Double Maths First Thing: Issue 68
Sep 2, 2026 · original
Double Maths First Thing is grateful to Past Colin’s organisation. Hello! My name is Colin and I am a mathematician on a mission to spread the joy and love of mathematics, even when deadlines are tight. Fortunately, I anticipated this might happen and prepared my links last week. Over the weekend, the Pseudorandom Ensemble had our last rehearsal before the Mathsworld show we’ll see you at on the 21st. A few rough edges to rehearse off in private, but we’ve got some absolute bangers to share with you. Links Regular readers will probably be aware of my occasional minor obsessions, and the UK Constituency dashboard ticks several boxes for me. Did you know that South Dorset generates £216 million in tax? Neither did I! Other important questions include, what happens when you throw a paper aeroplanes in space? and what actually happens to an arbitrary drum when you beat it? I feel like I must
Double Maths First Thing: Issue 67
Aug 26, 2026 · original
Double Maths First Thing is not, and has never been, down with the kids. Hello! My name is Colin and I am a mathematician on a mission to spread joy and delight in maths, puzzles and problem-solving. I’m just back from a week in Germany, where the highlight was the Heinz Nixdorf Museumsforum in Paderborn, a fantastic history of computing museum. I spent the whole afternoon going “THIS IS SO COOL!” and “I’ll catch you up, I need to get a picture of this.” It’s a super-rare three Michelin stars sort of museum. Links While the eclipse (as documented previously) was won by a skateboarder, here’s a close runner-up . Meanwhile, here’s a wonderful Desmos Doodle from Fractal Kitty In elliptic curve news: there have been discovered one of rank 30 and another of rank 31 – the previous record was 29, and had stood for a couple of years. I do not know what that means or why it’s important, but it so
Double Maths First Thing: Issue 66
Aug 19, 2026 · original
Double Maths First Thing gets its kicks on a.19792ish Hello! My name is Colin and I am a mathematician on a mission to spread the joy and love in doing maths, figuring stuff out, getting stuck and getting unstuck again. You’ll need to forgive a slightly brief end-of-summer DMFT; it’s the sort of week where there aren’t enough days to do everything that needs doing. Links I think it’s fair to say that Danny Leon won the eclipse. “When are we ever going to use that, miss?” “ Shut up and read about the topology and geometry of balloon polyhedra .” I once had a terrible journey: EVERY level crossing gate I came to was down. Worse than that, my train was late. Here’s a project to predict when your local level crossing is likely to be closed. A recent DMFT mentioned the reliance of the Apollo missions on seamstresses. Weavers – the “Little Old Ladies” also played a key role. It’s always good t
\(-e^{i\pi}\) to Watch: Ellie Sleightholm
Aug 17, 2026 · original
In this series of posts, we’ll be featuring mathematical video and streaming channels from all over the internet, by speaking to the creators of the channel and asking them about what they do. We spoke to Ellie Sleightholm about her YouTube channel, on which she posts roughly once a week to share the beauty in mathematics. Channel title : Ellie Sleightholm Link : youtube.com/elliesleightholm (YouTube) or instagram.com/ellieinstem (Instagram) Topics covered: Mainly mathematics but also cover videos on space and technology Average video length : 15 minutes on YouTube; 60 seconds on Instagram Recommended videos : Derivatives Aren’t What You Think They Are , Mathematician Visits Artemis II – Here’s What I Learned , and The Mathematics in Machine Learning What is your channel about, and why did it start? My channel is about uncovering the beauty of mathematics! Mathematics is everywhere, even
Double Maths First Thing: Issue 65
Aug 12, 2026 · original
Double Maths First Thing has an army of clones Hello! My name is Colin and I am a mathematician on a mission to spread the joy and delight of working things out. I had a delightful chat with young Bill about complex numbers and matrices and noticed that the difference between him and most of my students is that he wants to know how things work and how they fit together and why, while most young mathematicians I meet are interested in learning rules that get the Right Answer. Links There’s a solar eclipse happening today! Over the UK, it’s only partial (coverage from around 6pm-8pm our time); you can check details where you are here . Don’t look directly at it, that will frighten it. Colanders make very good shadow-creators. Here is a worksheet about the trigonometry of eclipses , a neat “when will we ever use that in real life?” answer; I found this Desmos activity a bit more engaging. S
Double Maths First Thing: Issue 64
Aug 5, 2026 · original
Double Maths First Thing is square in hex AND decimal! Hello! My name is Colin and I am a mathematician on a mission to share the joy and love in mathematics, to show that it’s more than the mindless memorisation of arbitrary rules. Guess who nearly got sucked into a 6 ÷ 2 × 3 debate on Mathstodon? I note that “the ISO 80000-2 standard for mathematical notation recommends only the solidus / or fraction bar for division.” So there. In more edifying news, this is issue #64 of Double Maths First Thing, which is 100 in decimal. However, it started at 0, so last week’s was “really” the hundredth issue. I noticed that the list of numbers that are squares in both hex and decimal is not in the OEIS, but equally, I’d struggle to justify it being interesting to anyone except DMFT readers, and even then maybe not many of you. Links I’m not flying anywhere this summer, so I’ve not heard anyone say “

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