Andrew Stacey
@mathforge.org
Mathematician: formerly academic (differential topology), currently educational (Head of Department in a UK secondary school).
Side interests in Maths & Programming & Art.
Website: https://loopspace.mathforge.org
Side interests in Maths & Programming & Art.
Website: https://loopspace.mathforge.org
Reposted by Andrew Stacey
Giant cardioid: version 2.5. Version 1.0 was made using Pex tubing and grommet tape. Version 2.0 was made from laser-cut pieces. The wood was too fragile, and it broke during construction. In version 2.5, I made the pieces wider and I used thicker wood. Success, I'd say! The diameter is about 5 ft.
November 9, 2025 at 4:34 PM
Giant cardioid: version 2.5. Version 1.0 was made using Pex tubing and grommet tape. Version 2.0 was made from laser-cut pieces. The wood was too fragile, and it broke during construction. In version 2.5, I made the pieces wider and I used thicker wood. Success, I'd say! The diameter is about 5 ft.
Reposted by Andrew Stacey
Interested in studying statistics @ox.ac.uk? Join us for our Postgraduate Open Day and find out more about the courses we offer.
📅 Wednesday 19 November 2025
⌚ From 1pm
📍 In-person and online
📃 Please register by Monday 17 November at: forms.office.com/r/Q6HxgLR16C
#postgrad #openday
📅 Wednesday 19 November 2025
⌚ From 1pm
📍 In-person and online
📃 Please register by Monday 17 November at: forms.office.com/r/Q6HxgLR16C
#postgrad #openday
November 5, 2025 at 4:37 PM
Interested in studying statistics @ox.ac.uk? Join us for our Postgraduate Open Day and find out more about the courses we offer.
📅 Wednesday 19 November 2025
⌚ From 1pm
📍 In-person and online
📃 Please register by Monday 17 November at: forms.office.com/r/Q6HxgLR16C
#postgrad #openday
📅 Wednesday 19 November 2025
⌚ From 1pm
📍 In-person and online
📃 Please register by Monday 17 November at: forms.office.com/r/Q6HxgLR16C
#postgrad #openday
Reposted by Andrew Stacey
We're hoping to avoid any interview horror stories this Halloween 👻 We've teamed up with @brasenoseoxford.bsky.social to host 11 online interview workshops 3–17 November for anyone applying to @cam.ac.uk or @ox.ac.uk for undergraduate courses. Find out more & sign up:
Applicant webinars 2025
St Catharine's College is collaborating with Brasenose College (University of Oxford) to deliver a series of free webinars in 2025 for students thinking of applying to the Universities of Oxford or Cambridge in 2026. Outreach staff will be delivering sessions with Oxbridge academics and students to:
caths.cam.ac.uk
October 31, 2025 at 9:30 AM
We're hoping to avoid any interview horror stories this Halloween 👻 We've teamed up with @brasenoseoxford.bsky.social to host 11 online interview workshops 3–17 November for anyone applying to @cam.ac.uk or @ox.ac.uk for undergraduate courses. Find out more & sign up:
Reposted by Andrew Stacey
Recently I was playing with the Square-Sums Puzzle (as explored previously by @standupmaths.bsky.social on Numberphile) and realised it would be fun for schools. So here is a FREE teacher resource: think-maths.co.uk/square-sums (and enjoy its use being modelled by my in-house mathematician below).
October 31, 2025 at 4:21 PM
Recently I was playing with the Square-Sums Puzzle (as explored previously by @standupmaths.bsky.social on Numberphile) and realised it would be fun for schools. So here is a FREE teacher resource: think-maths.co.uk/square-sums (and enjoy its use being modelled by my in-house mathematician below).
I even found a copy in that intellectual backwater that is Cambridge .
@teakayb.mathstodon.xyz.ap.brid.gy
@teakayb.mathstodon.xyz.ap.brid.gy
October 26, 2025 at 8:33 PM
I even found a copy in that intellectual backwater that is Cambridge .
@teakayb.mathstodon.xyz.ap.brid.gy
@teakayb.mathstodon.xyz.ap.brid.gy
A useful thread for anyone who buys ebooks.
Shall we talk about ebooks?
It might be a bit of a weird thing for a physical bookshop to do, but bear with me. There's a reason.
Take a seat for a short thread. 1/?
It might be a bit of a weird thing for a physical bookshop to do, but bear with me. There's a reason.
Take a seat for a short thread. 1/?
a woman in a suit and tie is smiling with #schitts creek written on the bottom
Alt: a woman in a suit and tie is smiling with #schitts creek written on the bottom
media.tenor.com
October 26, 2025 at 5:53 PM
A useful thread for anyone who buys ebooks.
Drove past Cambourne. Lovely rainbow visible as we went by.
Perhaps another column for the Large Data Set?
#ALevelMaths #UKMathsChat #mathsky
Perhaps another column for the Large Data Set?
#ALevelMaths #UKMathsChat #mathsky
October 24, 2025 at 5:21 PM
Drove past Cambourne. Lovely rainbow visible as we went by.
Perhaps another column for the Large Data Set?
#ALevelMaths #UKMathsChat #mathsky
Perhaps another column for the Large Data Set?
#ALevelMaths #UKMathsChat #mathsky
Family member just pondered whether anyone had made an earth sandwich.
Thanks to the #HoagieHomies, I was able to answer without hesitation.
(Or deviation. Or repetition.)
Thanks to the #HoagieHomies, I was able to answer without hesitation.
(Or deviation. Or repetition.)
October 22, 2025 at 8:10 PM
Family member just pondered whether anyone had made an earth sandwich.
Thanks to the #HoagieHomies, I was able to answer without hesitation.
(Or deviation. Or repetition.)
Thanks to the #HoagieHomies, I was able to answer without hesitation.
(Or deviation. Or repetition.)
I met with my independent study knot theory students today. We discussed Seifert surfaces (orientable surfaces whose boundaries are knots and links), and I showed them @mathforge.org's Seifert surface pieces. They had fun playing with them. github.com/loopspace/Se...
October 22, 2025 at 8:05 PM
They say that if you stay long enough in the Norrington Room then every author in the country will come and sign your book.
Spotted in Oxford's unique bookshop - @teakayb.mathsy.space
Spotted in Oxford's unique bookshop - @teakayb.mathsy.space
October 22, 2025 at 5:52 PM
They say that if you stay long enough in the Norrington Room then every author in the country will come and sign your book.
Spotted in Oxford's unique bookshop - @teakayb.mathsy.space
Spotted in Oxford's unique bookshop - @teakayb.mathsy.space
Had a bit of time after teaching series but not wanting to start the next topic, so told my Y13 Furthers about the analogy between functions and sequences that takes differential calculus to difference calculus. Lots of fun!
#MathsToday #ALevelMaths #UKMathsChat
#MathsToday #ALevelMaths #UKMathsChat
October 16, 2025 at 8:03 PM
Had a bit of time after teaching series but not wanting to start the next topic, so told my Y13 Furthers about the analogy between functions and sequences that takes differential calculus to difference calculus. Lots of fun!
#MathsToday #ALevelMaths #UKMathsChat
#MathsToday #ALevelMaths #UKMathsChat
I have an opportunity to get a new maths book. It's a book for me, not for work, so I want a maths book rather than a maths ed book.
Recommendations, please, for books that taught you a bit more actual maths.
#UKMathsChat #MathSky
Recommendations, please, for books that taught you a bit more actual maths.
#UKMathsChat #MathSky
October 16, 2025 at 8:00 PM
I have an opportunity to get a new maths book. It's a book for me, not for work, so I want a maths book rather than a maths ed book.
Recommendations, please, for books that taught you a bit more actual maths.
#UKMathsChat #MathSky
Recommendations, please, for books that taught you a bit more actual maths.
#UKMathsChat #MathSky
The Oxgordshire Youth Maths Conference was fantastic - but then I would say that, so here's Helen saying it so you can believe it!
#MathsToday #UKMathsChat
PS if you're in a secondary school in Oxfordshire, let me know if you're interested in attending next year.
#MathsToday #UKMathsChat
PS if you're in a secondary school in Oxfordshire, let me know if you're interested in attending next year.
Huge thanks to @mathforge.org for organising the inaugural Oxfordshire Youth Maths Conference this week. Our 6 students who participated loved it and my colleague who took them said it was just right-- superb presentations by the students, not too long and the right number of breaks. Congrats!
October 15, 2025 at 6:00 AM
The Oxgordshire Youth Maths Conference was fantastic - but then I would say that, so here's Helen saying it so you can believe it!
#MathsToday #UKMathsChat
PS if you're in a secondary school in Oxfordshire, let me know if you're interested in attending next year.
#MathsToday #UKMathsChat
PS if you're in a secondary school in Oxfordshire, let me know if you're interested in attending next year.
Just mistyped:
"encouragement al9ng"
It got underlined, with the suggested improvement:
"encouragement, al9ng"
"encouragement al9ng"
It got underlined, with the suggested improvement:
"encouragement, al9ng"
October 15, 2025 at 5:57 AM
Just mistyped:
"encouragement al9ng"
It got underlined, with the suggested improvement:
"encouragement, al9ng"
"encouragement al9ng"
It got underlined, with the suggested improvement:
"encouragement, al9ng"
October 14, 2025 at 10:21 PM
Gotta love it when Catriona plans my next lesson!
I thought Y7 might need a warm up to the task in the first picture, so I modelled a couple and got them to try their own numbers on MWB. Brilliantly, someone happened to get 23, 24 and 23. After such a near miss they were all very motivated to try and get a perfect triplet! #MathsToday
October 14, 2025 at 9:30 PM
Gotta love it when Catriona plans my next lesson!
Anyone got any funky applications of the method of differences? (Further maths alevel)
Asking for a friend
#UKMathsChat #MathsToday #mathsky #ITeachMaths
Asking for a friend
#UKMathsChat #MathsToday #mathsky #ITeachMaths
October 14, 2025 at 9:18 PM
Anyone got any funky applications of the method of differences? (Further maths alevel)
Asking for a friend
#UKMathsChat #MathsToday #mathsky #ITeachMaths
Asking for a friend
#UKMathsChat #MathsToday #mathsky #ITeachMaths
Gets my vote for the worst (ie best) pun
Asked my pal from Somerset if he knew anyone capable of taking the square root of -𝑟².
"I are!" he said.
That's a proof by country diction.
"I are!" he said.
That's a proof by country diction.
October 11, 2025 at 10:31 PM
Gets my vote for the worst (ie best) pun
Reposted by Andrew Stacey
The call for peer reviewers is very real - if you teach maths at the upper end of school through to early university and are interested in maths content useful to people like you, please get in touch via p.rowlett@shu.ac.uk - thanks!
#MathsToday #UKMathsChat #ALevelMaths #MathToday #MathSky
#MathsToday #UKMathsChat #ALevelMaths #MathToday #MathSky
October 8, 2025 at 5:23 PM
The call for peer reviewers is very real - if you teach maths at the upper end of school through to early university and are interested in maths content useful to people like you, please get in touch via p.rowlett@shu.ac.uk - thanks!
#MathsToday #UKMathsChat #ALevelMaths #MathToday #MathSky
#MathsToday #UKMathsChat #ALevelMaths #MathToday #MathSky
Further Maths today: used the method of differences to prove the summation of squares formula, thus also foreshadowing MoD as a more general technique.
Unfortunately, only left myself 3 minutes to do the sum of cubes.
Did it in 2.
#MathsToday #UKMathsChat #ALevelMaths
Unfortunately, only left myself 3 minutes to do the sum of cubes.
Did it in 2.
#MathsToday #UKMathsChat #ALevelMaths
October 7, 2025 at 8:47 PM
Further Maths today: used the method of differences to prove the summation of squares formula, thus also foreshadowing MoD as a more general technique.
Unfortunately, only left myself 3 minutes to do the sum of cubes.
Did it in 2.
#MathsToday #UKMathsChat #ALevelMaths
Unfortunately, only left myself 3 minutes to do the sum of cubes.
Did it in 2.
#MathsToday #UKMathsChat #ALevelMaths
Reposted by Andrew Stacey
Recommendations for where/how to get audiobooks that are not Amazon? (or whatever other company we have decided to cancel this week)
Yes I'm aware of my library but they don't have everything.
Yes I'm aware of my library but they don't have everything.
October 4, 2025 at 11:35 AM
Recommendations for where/how to get audiobooks that are not Amazon? (or whatever other company we have decided to cancel this week)
Yes I'm aware of my library but they don't have everything.
Yes I'm aware of my library but they don't have everything.
Reposted by Andrew Stacey
Perfect tribute today
One of my favorite anecdotes from THE PREHISTORY OF THE FAR SIDE: "That doesn't sound like the Jane Goodall we know."
October 1, 2025 at 8:06 PM
Perfect tribute today
Respect.
We are thrilled to announce that our NEW Large Language Model will be released on 11.18.25.
October 1, 2025 at 5:42 PM
Respect.