Sybille Rosset

Mathematician and educator. Sharing math puzzles 🧩, visuals, and occasional deep dives 🕵️‍♀️

[Sybille Rosset @Sybille2875]

As a teacher, I decided to test whether I could trust AI detectors to accurately detect when a student used AI.

The result: I cannot.

In the meantime, I decided to trust and wait 😌

[Sybille Rosset @Sybille2875]

I tested 3 AI detectors.

The result? They got everything backwards.

– My human-written notes → flagged as “mostly AI”
– AI-written stories → flagged “100% human”
Detectors aren’t detecting “AI.”
They’re detecting writing style.
And they’re terrible at it.

[James Tate @JamesTate121]

Thirty-five female journalists crowded into the White House Red Room that March day.
There weren't enough chairs. Many sat on the floor.
Male reporters watched from the doorway, smirking. The manager of the Associated Press said these gatherings wouldn't last six months.
Eleanor Roosevelt's strategy was brilliantly simple: If news organizations wanted access to the First Lady—if they wanted to know what was happening inside the White House—they would have to hire female reporters.
No exceptions.
At first, she covered household topics. But when Prohibition ended and reporters asked the President if beer would be served at the White House, FDR smiled and said two words:
"Ask Eleanor."
She announced the answer at her next women-only press conference.
Male reporters had to beg their female colleagues to tell them what the First Lady said.
Week after week, she made real news. She defended equal pay for equal work, low-cost housing, civil rights, and the minimum wage.
The tactic worked spectacularly.
The Associated Press brought on Bess Furman. United Press hired Ruby Black. The New York Herald Tribune sent Emma Bugbee for a few days—she stayed for months, her stories landing on the front page.
Over twelve years, Eleanor Roosevelt held 348 women-only press conferences.
Ruby Black called it "a New Deal for newswomen."
But Eleanor wasn't finished rewriting history.
After FDR's death in 1945, President Truman appointed her as a delegate to the United Nations.
Her male colleagues assigned her to a committee they considered unimportant—humanitarian and cultural concerns.
They assumed she'd do the least harm there.
They were wrong.
She was unanimously elected to chair the UN Commission on Human Rights.
For three years, she navigated Cold War politics and united 18 nations with competing interests to draft the Universal Declaration of Human Rights.
On December 10, 1948, the UN General Assembly voted.
Forty-eight nations in favor. Zero opposed.
When it passed, every delegate rose to give Eleanor Roosevelt a standing ovation.
She called it "an international Magna Carta for all mankind."
She considered it her greatest achievement.
And she was right.
From a woman who sat in a parlor with female reporters on the floor—to the architect of the document that defines human dignity for all humanity.
Eleanor Roosevelt didn't just break glass ceilings.
She built ladders so others could climb up after her.

[Sybille Rosset @Sybille2875]

@teachthemx3 I teach at university - never managed to make discovery learning work and eventually gave up.

Not discovery learning per se, but what does work for me is ask students to “place their bets”: according to their intuition, what would be the correct property? (3min pause max)

[Physics In History @PhysInHistory]

Hypatia of Alexandria (c. 370–415 AD) was a pioneering female mathematician, astronomer, and philosopher. She is renowned for her work on conic sections and her role as a prominent educator in Alexandria. Tragically, Hypatia was murdered by a mob in 415 AD, leading to the loss of many of her contributions.

[Sybille Rosset @Sybille2875]

@Mathonymics Just learned about taxicab numbers thanks to this post! If you don't know: 1729=1^3+12^3=9^3+10^3

[Sybille Rosset @Sybille2875]

@Brainybellzxc Wild indeed! As a math teacher, I have no interest in my students using AI to 'sound more human'. So for now I just decided to trust them! 🤷‍♀️

[Sybille Rosset @Sybille2875]

I tested 3 AI detectors.

The result? They got everything backwards.

– My human-written notes → flagged as “mostly AI”
– AI-written stories → flagged “100% human”
Detectors aren’t detecting “AI.”
They’re detecting writing style.
And they’re terrible at it.

[Sybille Rosset @Sybille2875]

Happy Fibonacci Day! (11/23)

[Alice Evans @_alice_evans]

What happens when Swedish women are biologically incapable of naturally bearing children?

They earn roughly the same as men!

Bravo to @landais_camille et al - who examine a rare congenital condition to track the gender pay gap.

(Assuming these women are otherwise normal).

[Sybille Rosset @Sybille2875]

@littmath Fun puzzle 🧩!
I agree with the other comments and would say n=6… unless you also count glueing as folding which would add two other possible value (n=2, obtained by glueing two opposite sides together, and n=3, obtained by glueing two consecutive sides together)

[Sybille Rosset @Sybille2875]

Complete test data here;
https://t.co/sLftWVUG4F

[Massimo @Rainmaker1973]

Visual proof that:

6 ⋅ (1² + 2² + ... + n²) = (n) (n+1) (2n+1)

[🎞️ Beau Janzen / reason4math]

[Sybille Rosset @Sybille2875]

@teachthemx3 0% is nearly impossible, and definitely not something not to aim for — you’d end up with weird syntax just to please the algorithm. The best option is to take the favourite paper of your advisor and check which percentage is estimated as AI — most probably more than 8% :)

[Sybille Rosset @Sybille2875]

Hence T is strictly between 0 and 1, so it cannot be an integer. Contradiction!

Hence, e is irrational. ✅

Fun, isn’t it? You can even give this as a student challenge—they can follow the logic without advanced machinery.

[Sybille Rosset @Sybille2875]

Think only 5 people can prove e is irrational (can’t be written as p/q for p,q integers)?

Try it yourself!

*Hint*: its series is the key 🔑

Simple, accessible proof in the comments. 🧵

[Andrzej Kukla @Mathinity_]

e – the most famous irrational constant. But did you know that only a few people on earth (5 at most) know how to prove its irrationality? 🤯

🚨 Wanna help out in increasing this number? You only need to read this post which contains a proof that e is irrational!

🧵[1/2]

[Sybille Rosset @Sybille2875]

But we can bound T by a geometric series smaller than 1, so 0< T <1.