Maths for the people!

Including introductory talks and articles for undergraduate students, outreach talks at schools, popular articles, and the occasional mathematical comic or poem.

###### Maths articles for the people

- Breakthroughs in primary school arithmetic

Humans have known how to multiply natural numbers for a long time. In primary school you learn how to multiply numbers using an algorithm which is often called long multiplication, and it was known to the ancient Babylonians. But it’s called “long” for a reason — you have to write a ... - From Liouville geometry to contact geometry

(Technical) We’re going to take Liouville structures and move them into 3 dimensions, to obtain contact structures. - Lovely Liouville geometry

(Technical) I’d like to show you some very nice geometry, involving some vector fields and differential forms. - Emmy had a theorem (mathematical nursery rhyme #2)

In the spirit of previous work in abstract algebra, I have, erm, adapted another nursery rhyme. To the tune of “Mary had a little lamb”, a discussion of Noether’s theorem. - Golay Golay Golay (Top of the autocorrelation world)

In 1949, Marcel Golay was thinking about spectrometry. Here’s what happened next… - Topological entropy: information in the limit of perfect eyesight

Entropy means many different things in different contexts, but there is a wonderful notion of entropy which is purely topological. It only requires a space, and a map on it. It is independent of geometry, or any other arbitrary features — it is a purely intrinsic concept. This notion, not surprisingly, is known as topological ... - Abstract algebra nursery rhyme

In the spirit of hilariously advanced baby books like Chris Ferrie’s Quantum Physics for Babies, I have taken to incorporating absurdly sophisticated concepts into nursery rhymes. - Limitless as that space too narrow for its inspirations

In which I recall, via neurologist Oliver Sacks, some musings of Sylvester from 1877 on the limitlessness of mathematics. - The Brain makes Contact with Contact Geometry

It’s always nice, intellectually, when two apparently unrelated areas collide. I had an experience of this sort recently with an area of mathematics — one very familiar to me — and an ostensibly completely distinct area of science. On the one hand, contact geometry — a field of pure mathematics, pure geometry. And on the other hand, the ... - “The beauty of mathematics shows itself to patient followers” — The work of Maryam Mirzakhani

The recent passing of Maryam Mirzakhani came as a shock to many of us in the world of mathematics. Together with Norman Do, we attempt to share something about Mirzakhani’s work. - Tutte meets Homfly

I’ll tell you about some extremely clever methods to tell graphs and knots apart, involving polynomials: the Tutte and HOMFLY polynomials. And they’re closely related. - Holy h-principle, Batman!

In which I attempt to explain some of the ideas behind the h-principle. - Every world in a grain of sand: John Nash’s astonishing geometry

After the recent tragic death of John Forbes Nash Jr, many tributes have been paid to this great mathematician, who was made famous by the movie “A Beautiful Mind”, and much has been said about his work on game theory. But less has been said about Nash’s other mathematical achievements. - Paranoid defence controls could criminalise teaching encryption

You might not think that an academic computer science course could be classified as an export of military technology. But under the Defence Trade Controls Act – which passed into law in April, and will come into force next year – there is a real possibility that even seemingly innocuous educational and research activities could ... - Why your calculator (and computer, and phone…) is a weapon

The Australian government may have classified your calculator — and phone, and computer, and every electronic device you own — as military weapons. - The Lost Art of Integration Impossibility

integration is less a science and more an art form. It high time we shed some light on this lost art. - Hyperbolic links

A set of links I collated about hyperbolic geometry. - Quadratic geography, algebraic extreme sports and magical Farey trees

Published in the Australian Mathematical Society Gazette “Mathellaneous” column. - Games with Galois

In 2004 for the Mathellaneous column of the AustMS Gazette, I wrote an article about games and Galois theory. - A Beautiful Sequence

In 2004, I wrote a recreational article for the Australian Mathematical Society Gazette about one of my favourite sequences. - The Exotic Realm of p-adic Numbers

A perhaps not-so-polished article I wrote for Paradox, the magazine of MUMS, the Melbourne University Mathematics and Statistics Society, as an undergraduate student. A very simple very brief introduction to p-adic numbers. - Some Mathematicians Like it Hot: Fourier and Descartes

A perhaps not-so-polished article I wrote for Paradox, the magazine of MUMS, the Melbourne University Mathematics and Statistics Society, as an undergraduate student. - Knot Man!

Of course the most important part of this webpage is the part devoted to mathematical superhero Knot Man. Known to others as Theodore J. Knott, in times of mathematical emergency, with his topological utility belt and supply of high-energy genus-1 donuts, he becomes Knot Man, Defender of the Mathematical Universe, saving the world from all ... - Adventures with Pascal’s triangle and binary numbers

An article I wrote for Paradox, the magazine of MUMS, the Melbourne University Mathematics and Statistics Society, as an undergraduate student. - Mathematical haiku

As an undergraduate student, I wrote some mathematical haiku.

###### Maths talks for the people

- “I liked doing what I wasn’t supposed to do”: the life and mathematics of Karen Uhlenbeck

In September 2019 I gave a talk about the life and some of the mathematics of Karen Uhlenbeck, the great mathematician and first woman to win an Abel Prize. This was a Monash LunchMaths seminar. - The beauty of mathematics shows itself to patient followers

In September 2018 I gave a talk on the life and mathematics of Maryam Mirzakhani in the School of Physical and Mathematical Sciences colloquium at NTU in Singapore. - Is the traditional mathematics blackboard lecture dead?

The Australian Mathematical Society Annual Meeting this year included a public debate on the topic “Is the traditional mathematics blackboard lecture dead?” I was on the affirmative team. - Some pure mathematics and consciousness

In November 2017 I gave a talk to the Monash Consciousness Research Laboratory (Tsuchiya Lab). I talked about some pure mathematical ideas that have appeared in the literature on the frontiers of neuroscience and the study of consciousness — gauge theory, and category theory. - Sciencey: Why do earphones get tangled?

An appearance in Sciencey, a new series from ABC that delivers quick, illuminating answers to some of the strangest questions in the universe. Why do earphones always tangle, and what does this tells us about the universe? - The work of Maryam Mirzakhani

In August 2017 I gave a talk on some of the mathematics of Maryam Mirzakhani, the great Iranian mathematician, first female Fields Medallist. This was a Monash LunchMaths seminar. - Maths week talk at PLC

I gave an outreach talk to secondary students at PLC about mathematics and mathematicians, talking about, among other things, topology, Maryam Mirzakhani, and billiards, in July 2017. Slides are available. - Mathematics, mathematicians, philosophy

In December 2016 I gave a talk to secondary school students about mathematics and mathematical philosophy. - Riddle. Mystery. Enigma.

I appear in a rather excellent and fun episode of the ABC Radio National program Radiotonic. - Why your calculator is a weapon

I gave a talk about the Defence Trade Cooperation Act, encryption, and number theory, as part of the Monash University LunchMaths seminar series, in August 2015. Slides are available. - To mathematics champions

In November 2014, I spoke at the Victorian prize ceremony for the Australian Mathematics Competition. - LunchMaths topology, Aug 2014

I gave an introductory talk on Topology, as part of the Monash University LunchMaths seminar series, in August 2014. Slides are available. - LunchMaths hyperbolic geometry, Sep 2013

I gave an introductory talk on Hyperbolic Geometry, as part of the Monash University LunchMaths seminar series, in September 2013. Slides are available.