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Rowena Ball

@Rowena.mathstodon.xyz.ap.brid.gy
13 followers 3 following 365 posts

Professor in mathematical sciences, with cross-disciplinary interests in all of the sciences. Leading new research and teaching program, 'Mathematics Without Borders' […] 🌉 bridged from ⁂ mathstodon.xyz/@Rowena, follow @ap.brid.gy to interact

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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 08/10/2026
Maurice Chiodo's Ethics in Mathematics course. Very timely. arxiv.org/abs/2610.08209 #Math #Mathematics #Ethics
arxiv.org
A Primer on Ethics in Mathematics
This is a course about Ethics in Mathematics. That is, about the ethical issues that arise in mathematics itself, in mathematical work, and in the actions of mathematicians, broadly interpreted to cover all mathematically-powered technologies. This is a novel course. Traditionally, ethics has seldom been considered by, let alone taught within, the mathematics discipline. This course seeks to change that, by bringing to light the specific ethical issues relevant to mathematics, in a way that is clear and understandable to mathematicians. This course is written by mathematicians, for mathematicians, and about mathematicians. It presents new and original material, in the form of case studies covering harmful and unethical behaviour, analysis of the causal chain of events leading to such harm, and examination of the surrounding processes that drive such actions. All this is fully cited, and supported with interactive activities to aid learning. It develops much of the foundational theory of ethics in mathematics: what can go wrong, why it goes wrong, and how to address it. Students and practitioners alike take away an understanding of the context of their mathematical work, and how to change their actions to ensure more appropriate and useful outputs. In contrast to more traditional philosophy teaching, this course does not delve into the depths of ethical theory. Rather, it presents a practical, hands-on, pragmatic approach to ethics in mathematics, treating it as a branch of applied ethics. It uncovers the very particular ethical issues that arise from mathematical technologies, as well as show how general principles from ethics and responsible development apply even to mathematical work. As such, this makes it highly relevant to adjacent areas such as computer science, physics, engineering, and any other numerate discipline.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 06/10/2026
China is offering 15-year research grants to the best young scientists for free exploration, the sole performance criterion being whether they are physically present in the laboratory. That pretty much used to be how the old IAS at ANU operated until 2000 when a conservative government (all of […]
mathstodon.xyz
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AJ Sadauskas @ajsadauskas.pixelfed.social.ap.brid.gy · 29/09/2026
Walking through Adelaide. #walk #walking #park #parks #cities #Adelaide #SouthAustralia #Australia
A row if white park lamps beside a path, where the winter trees have lost their leaves. The sun is gently setting in the distance.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 26/09/2026
Now that's what I call a bus! #transport #heritage
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Jonathan Kamens 86 47 @jik.federate.social.ap.brid.gy · 25/09/2026
#EconomicJustice is an #infosec issue. Cybersecurity defenders face an ever-growing flood of professionalized online criminal activity: hacking, scams, ransomware, fraud, etc., etc. One thing many online criminal groups have in common is, they’re located in impoverished countries where the […]
federate.social
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 23/09/2026
"Producing silicon steel is like planting an apple orchard, where each steel furnace symbolizes an individual apple tree." I do like reading technical industry manuals. It goes on: "The electromagnetic properties of the silicon steel emerge in a normal distribution, mirroring the assortment of […]
mathstodon.xyz
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AJ Sadauskas @ajsadauskas.pixelfed.social.ap.brid.gy · 23/09/2026
Adelaide's very grand railway station. #Adelaide #SouthAustralia #Australia #Building #Buildings #Architecture #Train #Trains #Rail #Railway #Railways #TrainStation #Photography #BuildingPhotography
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 22/09/2026
Hmm. Seems from online pictures that St Pauls cathedral is barrel vaulted. Perhaps could try other great houses of worship, although my son says "Mum, any church would burst into flames the moment you walk in". Huh. Rude.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 22/09/2026
New rib vaulted ceiling of State Library station, there is an unstable equilibrium in there, not marked (of course the roof is not going to fall in, that is the point), it is a partial phase portrait around a saddle point. I don't suppose architects call it […] [Original post on mathstodon.xyz]
New rib vaulted ceiling at State Library station Melbourne
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 22/09/2026
Still standing up tall and proud. I hope the old-timer signallers who worked up there are too. Disused signal box at Footscray station. Looks like a fortress up close! Inside, the zenith of electro-mechanical engineering. What is to become of this and hundreds similar?
Disused signal box at Footscray station,  Melbourne
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 21/09/2026
What does cross-disciplinary really mean? Also inter-disciplinary, trans-disciplinary, multi-disciplinary? Should there be 'disciplines' at all? What are disciplines anyway? Why are they so? Pondering. I have been asked – as a mathematician and theoretical physical scientist – to co-edit and […]
mathstodon.xyz
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AJ Sadauskas @ajsadauskas.pixelfed.social.ap.brid.gy · 18/09/2026
Adelaide's best-known public artwork, in Rundle Mall at sunset. #Adelaide #SouthAustralia #RundleMall #MallsBalls #Australia #photography #PublicArt
Two large reflective chrome balls stacked on top of each other, standing in a pedestrianised street.Same public sculpture from a different angle, showing more of the surrounding context.
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Timothy Gowers @wtgowers.bsky.social · 17/09/2026
I've written a blog post responding to the letter about maths and AI signed by 25 Fields medallists. As with the Leiden Declaration, I didn't sign it, but I agree with much of it and welcome its existence. gowers.wordpress.com/2026/09/17/w...
gowers.wordpress.com
Why I didn’t sign the Fields medallists’ letter
When I was around 11 I heard for the first time about Fermat’s Last Theorem. I was immediately captivated by the problem statement, as well as by the accompanying story, and made a fairly ser…
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 14/09/2026
Really cool astronomy up above tonight - planet Venus cradled by the crescent moon! Get out there quick!
Venus cradled by the crescent moon,  Canberra, Australia
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 06/09/2026
Leading truck wheel of legendary NSW steam locomotive 3801, currently on a visit to Canberra. See the conical profile? That is quite an interesting story. If the wheelset running on rails is shifted to the right, the effective curvature radius of the right […] [Original post on mathstodon.xyz]
Leading truck wheel of legendary NSW steam locomotive 3801, currently on a vist to Canberra. The conical profile of the wheel is evident.
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Karl Voit :emacs: :orgmode: @publicvoit.graz.social.ap.brid.gy · 05/09/2026
#SMBC: when #mathematicians would run the #economy: www.smbc-comics.com/comic/imagine-2 🤣 #fun #math
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 05/09/2026
"CHOCOLATE ORANGE'S" at the greengrocer! (Misplaced apostrophe and all.) So of course I absolutely had to buy some! Chocolate-brown-green skin and bright orange flesh. Very sweet and juicy for my dessert fruit, but I think it's BYO actual choccies. #foodie #fruit
Orange with green-brown skin and bright, sweet juicy flesh
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 02/09/2026
@mjb At least Hypatia was in fact born! Unlike, say, Euclid.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 01/09/2026
RE: aus.social/@joannaholman/1171948906… I once designed a tour called "Pub Walks Between Railway Stations." But no-one has ever been on this tour, not even me.
aus.social
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 01/09/2026
@janef0421 Clearly there are others in the industry who feel the same way, which goes to show that you are never alone even if it might seem so. If it is a parasitic, grifting industry you and those others will find an ethical market that values your work and your efforts to help others coming […]
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 31/08/2026
@janef0421 You are valued and the community needs you and the high quality of your work shines through. It will be ok.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 27/08/2026
@soaproot There is this Single Sign-On rubbish too at the university library. Pretty funny idea of Single when one has to Sign On several times just to get hold of an item. Single Sign-On At Every Screen Presented more likely.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 27/08/2026
RE: mathstodon.xyz/@DavidWood/117164400… Repeated compulsory MFA in the workplace is a real pain. Essential for systems security, we are told. But that's a form of blaming the victim. We, nearly 100% of employees, are not responsible individually for implementing or violations […]
mathstodon.xyz
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 26/08/2026
RE: mstdn.ca/@dbattistella/117162610488… Knowledge itself has been colonized. The European-centered understanding of science organized knowledge hierarchically. Western knowledge was considered “rational” and therefore superior, while knowledge systems outside the West were […]
mathstodon.xyz
Original post on mathstodon.xyz
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Ergative Absolutive @ergative.wandering.shop.ap.brid.gy · 25/08/2026
Work in progress of my Uzbek ceramics-inspired panel. Designs taken from Dr Esra Almahal's excellent book on Islamic biomorphic patterns. Materials are gouache on hot-press watercolour paper. #humanart #islamicgeometricart
Partially painted panel of blue and white Uzbek biomorphic decoration (white vinework on blue background), laid out in a geometric grid of stars and hexagons and bowtie shapes.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
@aj Oh it is such a delight, stealing long weekends away to explore the landscapes and stories of country and places where few city folks ever go! The humble little towns that display signs like 'State Tidy Town Runner-Up 1994'. Endlessly interesting! This is Wiradjuri country, for thousands of […]
mathstodon.xyz
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
and the dense morning fog wisps away to reveal landscapes and skyscapes of green and grey and gold and blue, and you never knew before that the plains, that such a vast flatness, across which you move so slowly, yet the speedo says 100 km/hr – is there […] [Original post on mathstodon.xyz]
Vast crops of canola under a blue sky as we cross the plains towards Barellan, NSW
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
@railmaps @railmaps.com.au Oh my! Thanks I didn't see that – how wonderful! There is potential for an interesting and varied round trip, then.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
A close consultation of @railmaps @railmaps.com.au online timetables indicates that you can still travel to Sydney from Spencer street via Tocumwal. Just take the Bendigo line to Echuca, stay the night, next morning – provided it's a Tues, Thurs, or Sat – take […] [Original post on mathstodon.xyz]
Hand operated crane in the yard at Narrandera station
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
Meanwhile, the engine of the down express would be turned on the turntable, ready for the up trip to Sydney in the morning. #railways #heritage
Old turntable at Narrrandera station
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
Now on the standard gauge, the rail motor would have taken about 4 hours, through a green and gold and grey dreamscape river gums, billabongs, canals, vast croplands, stopping at little townlets – Finlay, Jerilderie, Berrrigan, Widgewa, and more. You would […] [Original post on mathstodon.xyz]
Old pub opposite Narrandera station
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
where you might even have time for a game of billiards before the rail motor departed for Narrandera #pubs #heritage
From inside, a window at the Terminus pub at Tocumwal reads 'BILLIARDS' in reverse
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 24/08/2026
If you did travel by train from Melbourne to Sydney via Tocumwal before 1982, I assume the train from Spencer street might have taken about 4 hours to reach the end of the broad gauge at Tocumwal. You might arrive in time for lunch at the Refreshment Rooms on […] [Original post on mathstodon.xyz]
Terminus Hotel opposite the railway station at Tocumwal
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 23/08/2026
We followed the abandoned standard gauge line from Narrandera to Tocumwal. In case you get stuck on the vast timber trestle viaduct across the Murrumbidgee flood plain, with a train approaching, there is a thoughtfully placed timber safety refuge! Until 1982 […] [Original post on mathstodon.xyz]
Little safety refuge on the timber trestle viaduct that spans the entire Murrumbidgee flood plain, part of the abandoned Narrandera to Tocumwal branch line
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 22/08/2026
View from the rear balcony of our train as we cross the mighty Murray river – the racing waters almost doing a brimmer – at Tocumwal, Bangerang lands, on the 1895 centre-lift bridge. The bridge carried both trains and road traffic until 1987, so it is no. 4 in […] [Original post on mathstodon.xyz]
View from the rear balcony of our train as we cross the mighty Murray river at Tocumwal, Bangerang lands, on the 1895 centre-lift bridge.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 22/08/2026
My ride for today - first class on the broad gauge! #trains #railways #heritage
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 21/08/2026
Look! A three Pacific National loco looooong container train draws out of the Sun Rice factory on the triangle at Leeton, NSW, then onto the main! How lucky am I to happen on that! #trains #railways
3 Pacific National locomotives haul a loaded train out of the Sun Rice factory at Leeton, NSW
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Christian Lawson-Perfect @christianp.mathstodon.xyz.ap.brid.gy · 20/08/2026
Eddie Woo and the National Gallery of Australia have a new video series "charting the intersection between maths and art". The first one is about a sculpture called "Ouroboros", by Lindy Lee: www.youtube.com/watch?v=eJaRqLmmTQg #MathArt
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Tim Richards @timrichards.aus.social.ap.brid.gy · 14/08/2026
For #FensterFreitag - Romanesque arched windows within Goulburn railway station in New South Wales, Australia. #train #trains #Australia
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 11/08/2026
@electricrabbit.bsky.social @ajsadauskas Oh I see! That is a very special configuration. A worthy candidate. Sounds like it might look like a thin elevated carpark at times so train travel would be pleasantly suffused with schadenfreude.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 11/08/2026
@aj @electricrabbit.bsky.social @ajsadauskas Haha and this fool back east thinks they can count the old Grafton double-deck road-rail bridge as #3. It's a beauty and I'll search my old photos for it... sometime.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 11/08/2026
@electricrabbit.bsky.social @ajsadauskas Oh I dunno. Those angular tapered piers are very mid century moderne. You'd find them on the best HMV B&W TV sets. And as for excitement, there's nothing a laser light show at night won't fix. Does look like separate road and rail bridges tho, but I'll […]
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 10/08/2026
@electricrabbit.bsky.social @ajsadauskas Thanks! Two. Picture! At sunset (but any time will do).
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 10/08/2026
@ajsadauskas A rarity too. How many other dual rail/road bridges are there in Oz? A census, perfect time for a bridge census!
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 05/08/2026
Far out! Radical! Fab! In further confirmation that Australia's national capital remains forever stuck in a 1970s time-warp, Canberra's iconic concrete bus shelters installed in 1975 have been added to the Heritage Register. We want Gough! (Right-on, I guess you just had to have been there.) […]
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 02/08/2026
RE: famichiki.jp/@RachelThornSub/117025… Social media amplifies and glorifies such men, celebrating their birth days, death days, their (dubiously attributed) pithy epigrams, pictures of their tombstones, houses, handwriting... It never ends. Then one digs a bit deeper and […]
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 02/08/2026
@kerenlavelle.bsky.social They keep warm in Oberon. The pub opposite has a roaring open fire and a decent lunch menu!
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 02/08/2026
Many miles further along the winding highland ridge-top byway, another story is told in architecture: a tiny, lonely, humble church built of corrugated iron, long abandoned. Methodist or Presbyterian. For perhaps 60 years there was a white settler community […] [Original post on mathstodon.xyz]
A tiny, lonely, humble church built of corrugated iron, long abandoned. Methodist or Presbyterian.
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AJ Sadauskas @ajsadauskas.pixelfed.social.ap.brid.gy · 01/08/2026
Parramatta Railway Station at night... #train #rail #railway #station #TrainStation
A train station at night. Above is a metal roof with rows of lights. There's gaps in the roof above the tracks, through which the lights of nearby office buildings are visible. There's a train with yellow doors on another platform.
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Rowena Ball @rowena.mathstodon.xyz.ap.brid.gy · 01/08/2026
What an absolute beauty! A fine interwar Art Deco building on the main street of Oberon, a NSW country town of the uplands. Few visitors ever make it to Oberon; almost none at all since the highway at Victoria Pass collapsed, the town's only access from […] [Original post on mathstodon.xyz]
Art Deco building – Malachi Gilmore Hall, 1937, Oberon NSW
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