@leonardom@mathstodon.xyz

leonardo m. @leonardom@mathstodon.xyz · May 16, 2026

This is my Bongard problem n. 49, it's more abstract. Try to write your solution (with a spoiler if you want). Unlike all past problems I won't give my solution for this problem, I'll keep it open for future people looking at these problems.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 15, 2026

Replying to @johncarlosbaez@mathstodon.xyz

@johncarlosbaez@mathstodon.xyz Some magic is hidden even in rocks ;-)

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leonardo m. @leonardom@mathstodon.xyz · May 15, 2026

This is my Bongard problem n. 48, something simpler to relax. Try to write your solution (with a spoiler if you want). I'll give my solution tomorrow.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 14, 2026

This is my Bongard problem n. 47, and it's a meta Bongard problem like the precedent one (@leonardom@mathstodon.xyz ). I think you need a bit of thinking to solve this problem (and it required me some time to create it), have fun. Try to write your solution (with a spoiler if you want). I'll give my solution tomorrow.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 13, 2026

This is my Bongard problem n. 46, and it's a meta Bongard problem like the precedent one (@leonardom@mathstodon.xyz ). I think this is less easy. Try to write your solution (with a spoiler if you want). I'll give my solution tomorrow.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 12, 2026

This is my Bongard problem n. 45, and it's a meta Bongard problem: each of the 12 boxes is divided in 2 mini-boxes on the left and 2 mini-boxes on the right, and you need to solve these two sets of mini-boxes like a sub-problem first, distinct from all the other 11 sub-problems. The solution of the global Bongard problem is the rule that tells apart what's different between the sub-problems of the left and the sub-problems on the right. Try to write your solution (with a spoiler if you want). I'll give my solution tomorrow.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 11, 2026

For now that was my last problem about simple algorithms. Today I start a short sequence of problems on a little more abstract ideas.

This is my Bongard problem n. 44. Plenty of pixel art in this too :-) This should be easy enough. Try to write your solution (with a spoiler if you want). I'll give my solution tomorrow.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 09, 2026

This is my Bongard problem n. 43. This is the last for now on this topic. Try to write your solution (with a spoiler if you want). I'll give my solution in two days.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 08, 2026

This is my Bongard problem n. 42. This should be easy enough. Try to write your solution (with a spoiler if you want). I'll give my solution in one or two days.

For more info about Bongard problems in general take a look at my first messages:
@leonardom@mathstodon.xyz
@leonardom@mathstodon.xyz

#bongardproblem #mathpuzzle #puzzle #visualmath

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leonardo m. @leonardom@mathstodon.xyz · May 07, 2026

Replying to @0xThylacine@photog.social

@0xThylacine@photog.social precious lifeforms :-3

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leonardo m. @leonardom@mathstodon.xyz · May 06, 2026

Replying to @unchartedworlds@scicomm.xyz

@unchartedworlds@scicomm.xyz @merlinwisdom@mastodon.social sometimes the person neurotype (like ADHD) too could have a significant influence.

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leonardo m. @leonardom@mathstodon.xyz · Apr 29, 2026

Replying to @gutenberg_org@mastodon.social

@gutenberg_org@mastodon.social put her/him back in water :-)

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leonardo m. @leonardom@mathstodon.xyz · Apr 27, 2026

Replying to @johncarlosbaez@mathstodon.xyz

@johncarlosbaez@mathstodon.xyz the nice book "Thinking In Systems" by Donella Meadows helps build part of the intuition(s) useful to think about those matters. I remember when she explains about lever points in systems, and how they are often used in the wrong way: >This perverse kind of result can be seen all the time -- someone trying to fix a system is attracted intuitively to a policy lever that in fact does have a strong effect on the system. And then the well-intentioned fixer pulls the lever in the wrong direction!< >The world’s leaders are correctly fixated on economic growth as the answer to virtually all problems, but they’re pushing with all their might in the wrong direction.<

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leonardo m. @leonardom@mathstodon.xyz · Apr 27, 2026

Replying to @mjd@mathstodon.xyz

@mjd some people lose a job and find another one in few weeks/months, other people in a different situation lose a job and became jobless for years or even homeless. If you give advice then you also need to help people understand in what specific of the those situations they are.

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leonardo m. @leonardom@mathstodon.xyz · Apr 27, 2026

Replying to @byorgey@mathstodon.xyz

@byorgey >Have the courage to go slowly, especially when everyone else is telling you that you need to go fast and cut corners.< From what I'm reading in the last weeks, in some workplaces if you do this you risk getting fired. Giving advice to students is a delicate job. >Cultivate your ability to think deeply. Do whatever it takes to carve out distraction-free bubbles for yourself in both space and time. This might mean saying no to technologies or patterns of working that others say are critical or inevitable.< I believe in this. But sometimes it can be very hard to do.

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leonardo m. @leonardom@mathstodon.xyz · Apr 22, 2026

Replying to @Jose_A_Alonso@mathstodon.xyz

@Jose_A_Alonso@mathstodon.xyz What a trip! There are more ideas in this article than in whole nice books I've read. I appreciate the hope that AIs could help people make what matters in math more visible at all levels. >The software analogy helps understand the core issue. For normal software, quality is first and foremost a pragmatic notion—good code should compile, run smoothly in production and satisfy user needs.< I don't agree. Code needs to be readable, you need to be able to understand it, to be able to modify it, extend it, and reuse its ideas for other code bases. It isn't that different from the situation of math canonization.

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leonardo m. @leonardom@mathstodon.xyz · Apr 20, 2026

Replying to @johncarlosbaez@mathstodon.xyz

@johncarlosbaez@mathstodon.xyz I don't know book titles about that topic... But I read an article on close matters: https://web.archive.org/web/20251031193045/https://solar.lowtechmagazine.com/2021/03/urban-fish-ponds-low-tech-sewage-treatment-for-towns-and-cities/

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leonardo m. @leonardom@mathstodon.xyz · Apr 20, 2026

Replying to @johncarlosbaez@mathstodon.xyz

@johncarlosbaez@mathstodon.xyz nice article. Stuff like this is worth preserving also because sometimes a more enlightened era would come in future. But the practical (tacit) knowledge behind these ideas is less easy to preserve.

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leonardo m. @leonardom@mathstodon.xyz · Apr 18, 2026

Replying to @varikvalefor@mathstodon.xyz

@varikvalefor@mathstodon.xyz I don't fully understand...

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leonardo m. @leonardom@mathstodon.xyz · Apr 18, 2026

Replying to @henryseg@mathstodon.xyz

@henryseg you're awesome Henry. Also that room rivals Burkard Polster office...

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leonardo m. @leonardom@mathstodon.xyz · Apr 07, 2026

Replying to @fractalkitty@mathstodon.xyz

@fractalkitty@mathstodon.xyz they could help

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leonardo m. @leonardom@mathstodon.xyz · Apr 06, 2026

Replying to @peterluschny@mathstodon.xyz

@peterluschny@mathstodon.xyz between a basic Python version and a 'professional' C++ version there can be a bare-bones Rust translation of the Python code that runs tens of times faster than the Python code: https://gist.github.com/rust-play/95119ae26c206644976fd95f301edc32 :-)

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leonardo m. @leonardom@mathstodon.xyz · Mar 31, 2026

Replying to @andrejbauer@mathstodon.xyz

@andrejbauer@mathstodon.xyz why will Mathlib soon be left in the dust of history?

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