It’s been a long time since I posted anything here… and that doesn’t change now, except in a technical sense. My writing activities are currently split between my work for the European Mathematical Society (see here for why you should join) and writing about the current political situation, with which I am greviously displeased, on social media. If you are interested in the latter, see my Twitter account on your right, and I have also started a blog on Medium. The first post is: Remaining Angry.

# Elwes Elsewhere

I have a new post at The De Morgan Forum.

*As an ambitious young researcher, you can miss the wood for the trees. When you’re presented with a theorem, your inclination is to dive straight into the proof, and start grappling with the toughest ideas in there. But when you’re addressing a general audience, you have to step back, pause, and ask “What is the point of this theorem? Where did it come from? Why should we care?” You’re forced to adopt a different perspective on the subject, and that’s refreshing.*

Read more of my interview over at Math Frolic.

I have a guest post at The Aperiodical reporting on the London Mathematical Society’s birthday party last week, where Doctor Who was a recurring theme.

There are many songs in the world about love and loss, heartbreak and heart-ache. There are altogether fewer about algebraic geometry in the style of Alexander Grothendieck. Here is my attempt to fill that gap:

**Disclaimer:** I hope none of this needs saying, but just in case of misinterpretation:

1. No views expressed therein are attributable to any organisation to which I am affiliated.

2. Most of the views expressed therein are not attributable to me either, but are a deliberate exaggeration, for comic effect, of a common initial reaction to one’s first meeting with Grothendieck-style algebraic geometry.

3. It is not intended as a serious critique of any mathematician or school of mathematics!

**Lyrics**

When I was a young boy doing maths in class

I thought I knew it all.

Every test that I took, I was sure to pass.

I felt pride, and there never came a fall.Up at university, I found what life is for:

A world of mathematics, and all mine to explore.

Learning geometry and logic, I was having a ball.

Until I hit a wall…For I adore Euler and Erdős,

Élie Cartan and Ramanujan

Newton and Noether. But not to sound churlish

There’s one man I cannot understand.No, I can’t get to grips with Grothendieck,

My palms feel sweaty and my knees go weak.

I’m terrified that never will I master the technique

Of Les Éments de Géométrie Algébrique.He’s a thoughtful and a thorough theory-builder, sans pareil.

But can anybody help me find the secret, s’il vous plaît

Of this awe-inspiring generality and abstraction?

I have to say it’s driving me to total distraction.For instance… A Euclidean point is a location in space, and that we can all comprehend.

René Descartes added coordinates for the power and the rigour they lend.

Later came Zariski topology, where a point’s a type of algebraic set

Of dimension nought. Well, that’s not what I thought. But it’s ok. There’s hope for me yet!But now and contra all prior belief

We hear a point’s a prime ideal

In a locally ringed space, overlaid with a sheaf.

Professor G, is truly this for real?No, I can’t make head nor tail of Grothendieck

Or Deligne, or Serre, or any of that clique.

I’ll have to learn not to care whenever people speak

Of Les Fondements de la Géométrie Algébrique.But don’t take me for a geometrical fool.

I can do much more than merely prove the cosine rule.

I’ll calculate exotic spheres in dimension 29

And a variety of varieties, projective and affine.I’m comfortable with categories (though not if they’re derived)

I’ll tile hyperbolic space in dimension 25

I can compute curvature with the Gauss-Bonnet law

And just love the Leech Lattice in dimension 24.But algebro-geometric scheming

Leaves me spluttering and screaming.

And in logic too, you may call me absurd

But I wouldn’t know a topos, if trampled by a herd.I’ve tried Pursuing Stacks but they vanished out of sight,

I’ve fought with étale cohomology with all my might.

And Les Dérivateurs. It’s 2000 pages long.

I reach halfway through line 3, before it all goes badly wrong.No, I’ll never get to grips with Grothendieck

And I’m frightened that I’m failing as a mathematics geek.

All the same, I can’t deny the lure and the mystique

Of Le Séminaire de Géométrie Algébrique.– Richard Elwes, 2015

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If you’ve got a spare hour[1] at some stage here is a video of a talk I gave last month on Gödel, Incompleteness & Unprovable Theorems.

[1] The joy of the pause button is that the hour doesn’t have to form a single contiguous block.