Sign in

Andrew Stacey

@mathforge.org
1.8K followers 455 following 3K posts

Mathematician: formerly academic (differential topology), currently educational (Head of Department in a UK secondary school). Side interests in Maths & Programming & Art. Website: loopspace.mathforge.org

PostsRepliesMedia
Reposted by Andrew Stacey
Tommaths (he/him) @teakayb.mathsy.space · 26/09/2026
I've got one copy of *The Mathematicians' Library* to give away in each of four languages: Polish, German, Japanese, and Spanish. I'm offering them for free (including UK postage) & I'd like them to go somewhere that'd make good use of them. If you think *your* organisation or group would...
Four editions of The Mathematicians’ Library are arranged on a patterned surface: the Polish edition, German edition, Japanese edition and Spanish edition. The Polish and Spanish covers feature a Renaissance-style astronomical diagram with a Vitruvian figure, while the German edition has a vivid purple-and-pink fractal design and the Japanese edition shows colourful abstract mathematical forms.
277
Andrew Stacey @mathforge.org · 24/09/2026
Anyone making a slasher movie on the cheap and want a prop? Forgot to empty my pockets when putting my school clothes in the washer. #ITeachMaths
A towel with mysterious red marks on it, that could be blood but are more likely to be from the red pen I accidentally put in the washing machine.
040
Andrew Stacey @mathforge.org · 24/09/2026
And then you go to Scandinavia and end up in all sorts of trouble.
140
Andrew Stacey @mathforge.org · 24/09/2026
www.bbc.co.uk/news/article... I can't even ... so I won't! Instead, let's make this an alternative headline competition. I'll start: Farmer rounds down sheep, instead of rounding them up. #MathsToday #UKMathsChat #mathsky
bbc.co.uk
Jeremy Clarkson's sheep 'theft' turns out to be miscount on farm
Jeremy Clarkson reported the theft of sheep from his Diddly Squat Farm to police earlier this month.
2121
Andrew Stacey @mathforge.org · 23/09/2026
When a weird bug crops up in one of my programs, I can enjoy (!) figuring out what happens and why, and then fix it. This is because I wrote the original code. I remember fixing a similar bug, so fixing this new one doesn't actually take too long.
061
Andrew Stacey @mathforge.org · 20/09/2026
Watched BBC's new quiz "The Wisdom of the Crowds". Big turn-offs for me: 1. The intro. The correct way to refer to him is "the *eugenicist* Francis Galton". Or, preferably, not at all. 2. The questions. No distinction as to which average was being used. #mathsky #UKMathsChat #ALevelMaths
030
Andrew Stacey @mathforge.org · 18/09/2026
"integrated blackboard" *sigh* I'm still trying to persuade the ret of the family that such a design would revolutionise our house.
050
Andrew Stacey @mathforge.org · 16/09/2026
I was unaware that pie charts had any strengths ...
020
Andrew Stacey @mathforge.org · 15/09/2026
I'm reading "This Changes Everything" by Naomi Klein. The central tenet is that captialism works against our efforts to mitigate the effects of climate change. It feels remarkably applicable to current AI-ffairs.
120
Andrew Stacey @mathforge.org · 15/09/2026
This has provoked so many thoughts in my head, but the biggest of all is that this is what I want. Both for me and the mathematicians who come after me. #mathsky #ITeachMaths #UKMathsChat
080
Reposted by Andrew Stacey
Izabella Laba 🇨🇦 @ijlaba.bsky.social · 15/09/2026
And by that I don't just mean excluding cars from running competitions. People want to live in walkable cities. To walk to a grocery store, stop at a coffeehouse, sit down in a park. Less noise, less pollution. And a car stuck in rush hour traffic does not move very fast anyway.
181
Reposted by Andrew Stacey
Izabella Laba 🇨🇦 @ijlaba.bsky.social · 15/09/2026
I think the first step would be to recognize academic research more as work and less as a game. In work, there are professional standards for clarity, presentation, attribution, and responsibility to the community. This, again, is not a new problem, although AI does make it much worse.
2121
Andrew Stacey @mathforge.org · 15/09/2026
Great questions! Definitely going to steal them.
330
Reposted by Andrew Stacey
Izabella Laba 🇨🇦 @ijlaba.bsky.social · 15/09/2026
I love open source! I'm glad when people download my papers and share them with collaborators. The normal kind of scholarly use. Not slop feeding in bulk. Maybe Creative Commons needs to have a CC-BY-NC-NS (No Slop) option.
071
Andrew Stacey @mathforge.org · 14/09/2026
Folding some origami cranes, I got curious as to whether they could be made to interlock to make a modular origami model. It's not a great lock, but it shows it works in principle: the head and tail of the crane are flattened and tuck into the wings of its neighbours. #origami #mathsky
A modular origami model, where the model is based on the crane. The beak and tail interlock with the wings of its neighbours. Tgis model has six modules, so exhibits cubical symmetry.A modular origami model, where the model is based on the crane. The beak and tail interlock with the wings of its neighbours. Tgis model has six modules, so exhibits cubical symmetry.
040
Reposted by Andrew Stacey
nat alison @tesseralis.site · 10/09/2026
mathematicians now feel like they have to be secretive about what they do in case it gets stolen by AI. graph theorists arent too worried about this though because they’ve already been doing discreet mathematics
811830
Andrew Stacey @mathforge.org · 09/09/2026
Just realised today that the pigeonhole principle is not symmetric. You can put no pigeons in any number of pigeonholes, but you can't put a non-zero number of pigeons in no pigeonholes. #mathsky
040
Reposted by Andrew Stacey
Dr Huw Groucutt @huwgroucutt.bsky.social · 07/09/2026
Was just reminded of this figure i'd made in a paper from 2014. I like it. Illustrations of stone tools made by Neanderthals in SW Asia, some 55 thousand years ago. The darker the colour the later the flake removal in the sequence of preparation.
1155
Reposted by Andrew Stacey
Gro-Tsen @gro-tsen.bsky.social · 03/09/2026
While I appreciate their eloquence, and agree with many of their take takes, when it comes to “AI and math” (or indeed anything), I wish people would listen a little less to Fields medalists and a little more to the ~99.95% of mathematicians who are NOT Fields medalists, … •1/4
44410
Reposted by Andrew Stacey
Andrew Stacey @mathforge.org · 31/08/2026
New proof technique: Proof by Dobble loopspace.mathforge.org/CountingOnMy...
loopspace.mathforge.org
Proof By Dobble
151
Reposted by Andrew Stacey
Alexander Kasprzyk @amkasprzyk.bsky.social · 28/08/2026
Applications for Warwick Mathematics Institute's prestigious Zeeman Lectureships for Early Career Researchers are now open. Two positions are available, so if you know of a fantastic ECR, please encourage them to apply! @uni-of-warwick.bsky.social #MathSky warwick-careers.tal.net/vx/lang-en-G...
warwick-careers.tal.net
Warwick Zeeman Lecturer x2 (102592-0826) - University of Warwick
Title: Warwick Zeeman Lecturer x2 (102592-0826). Application Deadline: . Position Type: Fixed Term
045
Andrew Stacey @mathforge.org · 28/08/2026
I'm quote-posting because I don't want to spoil the puzzle, but I do want to talk about it as there's some lovely mathematics - especially in the "what changes make tgis work" part. So here's your chance to have a go beforehand, or to mute this thread. I'll post my thoughts below shortly.
231
Andrew Stacey @mathforge.org · 27/08/2026
Remember folks, when on holiday do *not* feed the local wildlife. They might try to follow you home.
The Headington shark. That is, a large fibreglass model of a shark sticking out of the roof of a terrace house in Headington (a suburb of Oxford).
020
Andrew Stacey @mathforge.org · 27/08/2026
Went to the Escher exhibition today at Somerset House. Went to the wrong entrance by mistake, so had to go down the stairs. And down the stairs again. And again. And again. I'm sure it's a good exhibition! I'll get there one day, I'm sure! #MCEscherUK #mathsky
0192
Andrew Stacey @mathforge.org · 27/08/2026
Normally, I'm against the practice of sending a small item in a large box, but I the case of Hagoromo chalk, I'll make an exception. The amount of packaging required to deliver it unharmed feels totally acceptable. #mathsky
A box of hagoromo chalk in front of the frankly insane amount t of packaging that was required to post the chalk unharmed.
070
Andrew Stacey @mathforge.org · 27/08/2026
Deep question from the dawn of term ...
130
Andrew Stacey @mathforge.org · 27/08/2026
So, the Vashta Nerada are attached to the rings in the second picture, and will no doubt consume them soon, but I don't know what's happening in the first! Some sort of reverse Vashta Nerada?? I think I need a Doctor ... #DoctorWho #DrWho #mathsky #ITeachMaths
280
Andrew Stacey @mathforge.org · 25/08/2026
The destination is not the destination. The journey is the destination.
031
Reposted by Andrew Stacey
Philipp Wacker @phkwacker.bsky.social · 25/08/2026
I've been thinking recently about how indigenous ways of teaching and learning could point us towards how to solve the current crisis of mathematics. My reach on Bluesky isn't exactly great so I'm yelling this at the void, but I'll just put down my thoughts here, since it lets me organise them.
133
Andrew Stacey @mathforge.org · 24/08/2026
The moon looks almost full tonight. But, then, I suppose it did eat nearly all of the sun not that long ago.
070
Andrew Stacey @mathforge.org · 22/08/2026
Optimist: the glass is half full. Pessimist: the glass is half empty. Topologist: the glass is a disc, and what's that wet patch on the floor?
1203
Andrew Stacey @mathforge.org · 22/08/2026
Fake news. A clear attempt to recast Willerby in order to develop it and plough up the grey belt. #WillerbyIsReal #SaveWillerby #IBelieveInWillerby
121
Reposted by Andrew Stacey
The Maths Bazaar @themathsbazaar.bsky.social · 18/08/2026
If you’re cis and have been challenged or stopped because you’re perceived to be trans (eg a cis woman being challenged in women’s toilets), this form is for you too. TERF Toilet Police make everybody less safe, including all women and children. Don't let the bigots get away with it.
073
Andrew Stacey @mathforge.org · 18/08/2026
I have downloaded the Screwfix app to my phone. Am I now an adult??
150
Reposted by Andrew Stacey
Andrew Stacey @mathforge.org · 16/08/2026
Guard, witch, death, or wizzard?
301
Andrew Stacey @mathforge.org · 16/08/2026
Guard, witch, death, or wizzard?
301
Reposted by Andrew Stacey
James Murgatroyd @mrmurgsmaths.bsky.social · 11/08/2026
I've wasted months of my life planning what I'd do with that Big Lottery win. Almost none of it involves what I'd buy for me. Family and close friends? Set for life. My school? Swimming pool and athletics track plus lots and lots and lots of opportunities for students to break through walls.
static.klipy.com
Making It Rain Money
ALT: Making It Rain Money
041
Reposted by Andrew Stacey
Michael Pershan @mpershan.bsky.social · 11/08/2026
022
Reposted by Andrew Stacey
Colleen Young @colleenyoung.bsky.social · 11/08/2026
Useful links for Exam Board Results Statistics, Grade Boundaries, Analytics, and access to Scripts ready for Results Days. I will keep the page updated. colleenyoung.org/im-looking-f...
colleenyoung.org
Exam Results 2026
FFT Blog – Five things to look out for on results day for A-Levels, T-Levels and other Level 3 qualifications fft education datalab Use the following links for provisional results statistics and gr…
3133
Reposted by Andrew Stacey
Dr Abolish ICE @pwr2dppl.bsky.social · 09/08/2026
Piper Harris

The Liberated (and unemployed) Mathematician, Black + AuDHD + Not Open to Being Mistreated
I am losing my grasp on my desire to see the good. I watched the fascism and felt on fire. Now the fascism has stabilized somewhat (new terrible headlines are less frequent; or maybe I stopped reading them... at any rate, things are less surprising... basically fascism is the new covid but covid is still here and fascism never wasn't..) I am watching Math Academia give up completely. 

USian mathematicians turning to "AI" as a new exciting thing are Educated Enough to understand why many Black and Indigenous and disabled mathematicians feel sick at this turn of events. They don't want to know, and they are not asking. 

If you are a successful mathematician and you are doing "AI" (this stuff isn't AI) for reasons of advancement: GIVE YOUR MONEY TO THE HUMANS WHOSE NEEDS YOU ARE SIDELINING. (i'd rather you just not do "AI" until it exists ethically, this is me compromising.)

We need HUMANITY in math! !!!!!! !!!!!!!!!! in everywhere. 

please i'm begging you. have a heart.
2123
Andrew Stacey @mathforge.org · 09/08/2026
Feel like the Greeks ran out of ideas here. #HoagieHomies #mathsky #MathInTheSky
A screenshot from a star map app (StarWalk2) showing the constellation "triangulum".
030
Andrew Stacey @mathforge.org · 09/08/2026
What is this liquid that falls from the sky? I have never seen its like before! It is most wondrously refreshing. #NorthernWeather
250
Reposted by Andrew Stacey
Dr Surekha Davies, Historical Monster Consultant (she/her) @drsurekhadavies.bsky.social · 06/08/2026
Petition signable by UK citizens or residents, asking "the Government to introduce a statutory duty requiring AI developers to disclose the copyrighted works used to train generative AI in enough detail..." 💙📚 🗃 #academicsky 1/ petition.parliament.uk/petitions/76...
petition.parliament.uk
Petition: Protect creators' rights: require AI firms to disclose training data
We ask the Government to introduce a statutory duty requiring AI developers to disclose the copyrighted works used to train generative AI in enough detail for creators to identify use of their work, e...
23929
Andrew Stacey @mathforge.org · 06/08/2026
Well, I had to ask, didn't I? Pros: it's smooth, without being overly analytic. Although individual support is guarded [bounded], taken together, it's total. Cons: can be a bit derivative, and while many norms are accepted, they rapidly decrease after a bit. Felt a bit dark [Schwartz]. #mathsky
A poster on the side of an old-fashioned English pub saying "Ask us sbout our function space"

Below that, it says "Available for all occasions" and then "Please speak to a member of the team for more info"
2161
Reposted by Andrew Stacey
Colchester Museums @colmuseums.bsky.social · 04/08/2026
A six-metre Moon inside Colchester Castle. At a scale of approximately 1:600,000, every centimetre of Museum of the Moon represents six kilometres of the lunar surface. Come and look closer: colchester.cimuseums.org.uk/events/moon-...
Close-up of a highly detailed lunar surface model displayed in a museum, overlaid with bold white text "EVERY CENTIMETRE TELLS A STORY." and a small Colchester Castle logo, advertising a hands-on exhibit that invites careful, measured exploration.
0196
Andrew Stacey @mathforge.org · 04/08/2026
Will be in the vicinity of Hay-on-Wye soon. Does anyone know of any bookshops that have a good maths selection? 2nd hand, preferably. @missradders.bsky.social #UKMathsChat #mathsky
322
Andrew Stacey @mathforge.org · 03/08/2026
Yet again, I find myself wishing that SatNav had an option for "avoid single track roads". And then a refinement for single track roads with high hedges and tractors that other people drive at the actual speed limit along. And a further one for cows.
280
Reposted by Andrew Stacey
dave @beesandbombs.bsky.social · 02/08/2026
:)
09514
Andrew Stacey @mathforge.org · 01/08/2026
Dodger, by Terry Pratchett, is 99p as an ebook. For those unsure, "London" is a real place and not part of the Discworld. I know it often seems like it is ...
030
Reposted by Andrew Stacey
The Deceitful Grin of Civility @andrewfleer.com · 01/08/2026
A utility pole with a blue sign reading, "Please like and share this post"
010030