this post was submitted on 29 Oct 2024
380 points (97.5% liked)

A place for everything about math

806 readers
1 users here now

founded 5 years ago
MODERATORS
 

Two students who discovered a seemingly impossible proof to the Pythagorean theorem in 2022 have wowed the math community again with nine completely new solutions to the problem.

While still in high school, Ne'Kiya Jackson and Calcea Johnson from Louisiana used trigonometry to prove the 2,000-year-old Pythagorean theorem, which states that the sum of the squares of a right triangle's two shorter sides are equal to the square of the triangle's longest side (the hypotenuse). Mathematicians had long thought that using trigonometry to prove the theorem was unworkable, given that the fundamental formulas for trigonometry are based on the assumption that the theorem is true.

Jackson and Johnson came up with their "impossible" proof in answer to a bonus question in a school math contest. They presented their work at an American Mathematical Society meeting in 2023, but the proof hadn't been thoroughly scrutinized at that point. Now, a new paper published Monday (Oct. 28) in the journal American Mathematical Monthlyshows their solution held up to peer review. Not only that, but the two students also outlined nine more proofs to the Pythagorean theorem using trigonometry.

all 33 comments
sorted by: hot top controversial new old
[–] [email protected] 79 points 1 month ago (2 children)

I'm constantly amazed by the number of things that we have assumed was true simply because we were taught that in school and never questioned it.

[–] anon6789 22 points 1 month ago

Do check out the quote from the girls' research paper I put in the other reply thread. Even they couldn't believe they actually did it. From my very basic understanding of what they achieved, it is something pretty monumental.

[–] Mango 1 points 1 month ago (1 children)

Yo, me too!

I like to tell people about how everything they think they know is actually stuff someone told them and they believed based on the presentation. School is certainly a good look right after you leave church, yeah? Seems very sane and rational. Tons of the stuff you "learn" is self evidently correct which helps you believe all the rhetoric that props up nationalism and whatnot.

There's no telling what's real or made up to keep us in line as individuals, and good luck gathering free thinkers and maintaining information integrity with a group.

[–] [email protected] 5 points 1 month ago* (last edited 1 month ago) (1 children)

Oh for god sakes. The vast majority of things you learn in school, that aren’t basic things like language and physical education anyway, actively have you participate in the process of working through to the correct answer.

I’m not going to say that you remember the process. But you didn’t spend weeks in class learning how to punch numbers into a calculator, you were taught about the process, why that process works, and literally hand held through the process of you being the one to come to the eventual answer.

This applies to many subjects, like science and math.

I will admit, this may not be the case for all classrooms. But I can say with certainty that this is the case for North America, and most if not all western nations.

If you truly think you’re simply told what to think and turned out to the world… you likely didn't actually pay attention.

[–] Mango -1 points 1 month ago (1 children)

They're brainwashing everyone in history class, but it's okay because they're also teaching us the little bit of math we need to operate an industrial saw as a dead end job?

[–] [email protected] 2 points 1 month ago (1 children)

I think we didn't go to the same schools.

We didn't get enough education for operating a saw.

[–] Mango 0 points 1 month ago (1 children)

You didn't learn to convert fractions and decimals? Damn, your school sucks.

[–] [email protected] 0 points 1 month ago

You tell me.

At least I missed the wave of paedophilia that's apparently getting uncovered in that country's school system nowadays.

[–] ramenshaman 20 points 1 month ago

Neeeeeerrrds!!

Jk jk that's super impressive

[–] [email protected] 18 points 1 month ago (1 children)

I wish I was high on potenuse

[–] [email protected] 7 points 1 month ago (1 children)

I WISH I WAS HIGH ON POTENUSE

[–] RubberElectrons 1 points 1 month ago (1 children)

IF I SAY THE JOKE AGAIN, BUT I SAY IT, IT'S MORE FUNNIER

[–] [email protected] 13 points 1 month ago* (last edited 1 month ago)

Actually there was already a known proof of PT that was based on trigonometry, the proof of the students is also unlikely to be accepted as it relies on calculus and not pure trigonometry.

[–] RizzRustbolt 11 points 1 month ago

Can't fool me. They're actually searching for the holy ratio that Pythagoras discovered and kept from his cult members.

[–] gerbler 8 points 1 month ago (2 children)

Does this mean it's going to henceforth be referred to as the Pythagorean Principle or something or does it still remain a theorem after proving.

[–] joshthewaster 15 points 1 month ago

A conjecture is a problem that is expected to be true but has not been proven. So it remains a theorem because it has already been proven. What they did is to prove it in a new way. New proofs could just be interesting or they could provide a new way to think about other un proven problems.

[–] [email protected] 7 points 1 month ago (3 children)

I'm not a mathologist, so this reads to me like "they proved it is what it is because of the way it is. That's pretty neat!"

I can understand it's significant, but that's about it. From my understanding, this doesn't really change anything about math, it's just something we didn't think was possible being proven possible.

Please correct me, mathletes! Hilariously almost all my fields of interest require math... cries in physics

[–] anon6789 29 points 1 month ago* (last edited 1 month ago) (1 children)

By proving Pythagoras' theorem using trigonometry, but without using the theorem itself, the two young women overcame a failure of logic known as circular reasoning.

Before these young ladies came up with these proofs, the only way people could come up with to balance the equation was to use things that boiled down to the actual thing they were trying to prove. It's like saying all things are made of atoms, but then people say well what the heck are atoms made of, smartypants?! So these girls found the Higgs-Boson of trigonometry while in high school as a piece of extra credit on a test. That's my understanding as a low B, high C math student.

Edit: For any of you that are mathy, here is their actual paper.

From the Conclusion of the paper:

The reader may be surprised to learn that the catalyst for us to start this project was a bonus question of a high school math contest. The bonus question was to create a new proof of the Pythagorean theorem. Motivated by the $500 prize, we independently decided to take on this task. It proved to be much harder than we first imagined, and we each spent many long nights trying and failing to create a proof. After roughly a month of mental labor, we each completed and submitted our work. Mr. Rich, a math volunteer at our high school, believed our proofs were novel enough to be presented at a mathematical conference. Neither of us had such confidence in our work at that point, but we decided to go along with it anyway. This is when we began to work together.

For the next two to three months, we spent all of our free time perfecting and polishing our work. We worked both independently and together after school, on weekends, and even during holidays. In the process, with Mr. Rich as our faculty advisor, we created additional proofs. We did all of this not knowing if we would even be allowed to present at the conference, which is usually only done by professional mathematicians, and occasionally college students. To our surprise, our high school work was taken seriously, and we were approved to present at the American Mathematical Society’s Southeastern Sectional conference in March of 2023. Being the youngest people in the room and the youngest presenters was terrifying, but knowing that this was the culmination of all of our previous efforts gave us the confidence to present.

We were then encouraged by the AMS to submit our findings to an academic journal. This proved to be the most daunting task of all, since we had absolutely no experience writing for an academic journal. We were both also dealing with the stressors that come with adjusting to the college environment. Learning how to code in LaTeX is not so simple when you’re also trying to write a 5 page essay with a group, and submit a data analysis for a lab. With the guidance and wisdom of our mentors, and a lot of personal dedication, we were able to craft this paper. The support of our family and later our community helped us to persevere. Our journey to this point was by no means simple or straightforward. There was no road map laid out for us, and there certainly was no guarantee that any of our work would go further than our own heads. There were many times when both of us wanted to abandon this project, but we decided to persevere to finish what we started.

[–] Crackhappy 8 points 1 month ago (1 children)

Huh. Reading that paper, I understand. Throw out the nonsensical and focus on the actual and the solutions are right there. Interesting.

[–] [email protected] 8 points 1 month ago (1 children)

You know, I'm still not "mathy"... But it made way more sense just reading the actual paper than it did reading summaries, explanations, or the article.

[–] Crackhappy 2 points 1 month ago

Thanks, Chief.

[–] thesohoriots 10 points 1 month ago* (last edited 1 month ago)

It’ll sound like splitting hairs, but I’ll try:

Trigonometry is based on the Pythagorean theory being true. They proved the Pythagorean theorem effectively in reverse without using the theorem itself as a basis. So they used the structure of trigonometry to prove the basic underlying principle of trigonometry. Bad analogy: kind of like if you have an airplane first, and THEN you worked out the physics of lift. You knew it could fly and how to fly it, but never questioned how it worked.

[–] [email protected] 4 points 1 month ago (1 children)

I'm not that great either but to my understanding you are right. The thing is by giving a solid proof foundation to what was mostly glued together by basic understanding we can now build over it and arrive to new things.

[–] [email protected] 3 points 1 month ago

Neat!

So super simplistic paraphrasing, once you know the shape of the box, you can start mapping around it? Maybe?

[–] [email protected] 3 points 1 month ago
[–] finitebanjo 1 points 1 month ago* (last edited 1 month ago)

Reminds me of the inverted klein flask problem that stumped researchers for months before they realized the 4th form was just a mirrored 3rd form.

[–] [email protected] 0 points 1 month ago
[–] StaticFalconar -5 points 1 month ago

Is this an example of common core math actually working since forces them to prove the same thing in ten different ways?