BR Maths Corner-1

[Amber G.]

Just realized, Nicușor Daniel Dan , Romania's new president won IMO gold medals in two years and perfect scores. Probably a first.

Sharing:

Nicuşor Dan, Romania’s president and a two-time International Mathematics Olympiad gold medallist.

Nicușor Dan, is a fascinating figure — a former math prodigy who scored perfect marks twice at the International Math Olympiad. He’s known not just for his sharp analytical mind, but also for being down-to-earth and thoughtful. (Heard him a few years ago - and liked it - seems to combine deep mathematical thinking with a practical sense of human nature, which is rare)

His election reminds me of another leader (only I can recall) with a strong math background — Lee Hsien Loong of Singapore, who was Senior Wrangler at Cambridge.

More: Nicușor Dan, the maths prodigy who beat an ultranationalist for Romanian presidency

[Vayutuvan]

https://ramanujanexplained.org/

Came across the above interesting website founded by Gaurav Bhatnagar

First Lecture

Abstract
We begin our study of Ramanujan’s identities. The Rogers-Ramanujan identities appear Chapter 16 of Volume 3 of Berndt’s Ramanujan’s notebooks. One of the key results is the q-binomial theorem. We will begin with a discovery approach to the binomial theorem and then give Ramanujan’s own proof of the q-binomial theorem. Ramanujan developed hypergeometric series in an earlier chapter, so chances are that he was motivated to find a more general series with an additional parameter.

[Amber G.]

Big congrats to Eshan Chattopadhyay and David Zuckerman for winning the 2025 Gödel Prize! Their groundbreaking research on explicit two-source extractors is a game-changer in theoretical computer science. Eshan, an Indian-origin professor at Cornell University, and David, a professor at UT Austin, have made significant contributions to pseudorandomness and computational complexity. Their work has opened up new avenues in randomness extraction and Ramsey graphs. Cheers to their achievement! #GodelPrize #ComputerScience #Mathematics

Link:The 2025 Gödel Prize has been awarded to Eshan Chattopadhyay and David Zuckerman.

[Vayutuvan]

https://www.youtube.com/watch?v=e4kOh7qlsM4

~ 29 min video on Riemann Hypothesis. Totally self-contained (including a quick 5 min introduction to complex number plane) with lovely animations.

What is the Riemann Hypothesis REALLY about?

HexagonVideos
674,508 views Dec 12, 2022

Solve one equation and earn a million dollars! We will explorer the secrets behind the Riemann Hypothesis - the most famous open problem in mathematics - and what it would tell us about prime numbers.

I should have mentioned one additional property, namely zeros are mirrored along the line 1/2, even though non of them are found and maybe even non of them even exist. This way, every zero not on the line would give a harmonic with Re(s) greater than 1/2, thereby breaking the estimates for the prime counting function.

[Amber G.]

The 66ᵗʰ International Mathematical Olympiad (IMO) 2025:

-Taking place July 10–20, 2025, with official events beginning July 10 and contest days on July 15–16
- Hosted in Sunshine Coast, Queensland, Australia, at the Sunshine Coast Convention Centre.
At present the official IMO site confirms the country registrations but doesn’t list exact participant numbers. India and US both are taking part, but their team member names are not 'officially' announced yet on the the website(s) - both International and local/national official sites. (Wish they kept it more up-to-date). India's team was selected around end of May (after HBCSE Training Camp). I wished the list should have been public by now.

(Good luck and best wishes to Archit Manas, Able, Kanav, Adhitya, Aarav and Adish. - Picture Credit - SM of a friend)


Both teams are particularly strong. (in 2024, Team USA scored 192 points, securing 1st place)

[Amber G.]

It is not officially posted (yet):

India secured 3 Gold Medals, 2 Silver Medals and 1 Bronze Medal at the International Mathematical Olympiad (IMO) 2025 held at Sunshine Coast, Australia. The team achieved the highest ever total score of 193 since India's first participation in IMO in 1989.

1. Adhitya Mangudy (GOLD)
2. Kanav Talwar (GOLD)
3. Aarav Gupta (GOLD)
4. Abel George Mathew (SILVER)
5. Aadish Jain (SILVER)
6. Archit Manas (BRONZE)

Congratulations!

[Amber G.]

^^^
Looks like two people missed the gold by just 2 points and Archit lost silver by 2 points...

Results are not *official* yet.. but China, United States, South Korea, Japan, and Poland are on top 5 . India is (most likely) at 7th. (Standing may change).. I think Iran will be just after India.

The official site still does not have them results at the time of this posting.. )

[Vayutuvan]

The above page is not loading. Only main page https://www.imo-official.org/ is loading. Maybe too much load on the website.

[Amber G.]

^^^ As said, results were/are not official - though I am sure of medal cut-off points and Indian team scores (The team achieved the highest ever total score since it starting taking part).

-- just added --
But now as I post this, the results are official. It should be on the imo site. now.

- Tid bits - 5 people scored perfect scores! (Q-6 was relatively hard - most missed it.
- USA with 5 gold and 1 silver was in second place.

[Vayutuvan]

- USA with 5 gold and 1 silver was in second place.

Does that mean China in the first place got 6 golds? Wow.

[Prem Kumar]

I think China has been getting 6 golds for a while now, with a couple of them getting a perfect score each year

China is at #2 as well - we will know when we look at the US IMO team picture

[Vayutuvan]

I think China has been getting 6 golds for a while now, with a couple of them getting a perfect score each year
China is at #2 as well - we will know when we look at the US IMO team picture

[Amber G.]

Kudos to Prof. Shanta Laishram and the team!


(All scores, and medals, I put here yesterday are confirmed officially)

Indian students shine again at the International Mathematical Olympiad!

[Amber G.]

Okay I don't know how much serious interest is here in advanced math/science but for those into who love math/science — bright high schoolers or anyone who knows one in India — this is worth a look!

Only a few days left to register for IOQM — the first step toward representing India at the International Math Olympiad. Challenge yourself with the best.

[Vayutuvan]

https://www.youtube.com/watch?v=Cqlpr0W0-34

I love this teacher's excitement and joy. Very infectious.

[Vayutuvan]

[Vayutuvan]

This is same as the original Euler's solution

Then there is a physical/geometric derivation with beautiful animation.

[A_Gupta]

@Vayutuvan, any suggested reading? (Re: viewtopic.php?p=2654756#p2654756 )

[Amber G.]

This is relatively easy problem

One day, Arya decided to make up a number sequence just for fun.
She started with:
𝑎₂ = 2
𝑎₃ = 3
Then she came up with two simple rules to create the rest of the numbers:

To get a number in an even position (like 𝑎₄ 𝑎₆ 𝑎₈ etc), she adds 2 to the numbers at position k and k+1:
𝑎₂ₖ₊₂=2+𝑎ₖ+𝑎ₖ₊₁

To get a number in an odd position (like 𝑎₃, 𝑎₅. 𝑎₇ etc), she takes 2 times the number at position k, and adds 2:
𝑎₂ₖ₊₁ = 2 + 2𝑎ₖ

Now Arya wonders:
For which positive numbers n’s (𝑎ₙ/n) whole number (an integer)?
Can you help her figure it out?

[Vayutuvan]

@Vayutuvan, any suggested reading? (Re: viewtopic.php?p=2654756#p2654756 )

I will try to organize my thoughts. It would be help if I know two things.

1. Why do you ask how to generate problems
2. Your domain. My guess is that you are very good at engineering physics. I read on BRF that you took courses with Richard Feynman. Are you a physicist? You also have done course in ML at Stanford (online certificate). I heard it is a very tough course.

It is not necessary though.

[Amber G.]

Historic Breakthrough in Mathematics: Geometric Langlands Conjecture Proven

One of the most important breakthroughs in modern mathematics has just been achieved — and it’s quietly making waves. The long-elusive geometric Langlands conjecture, a central pillar of the so-called Langlands programme (often dubbed the "grand unified theory of mathematics"), has finally been proven and published. This proof — nearly 1,000 pages long and years in the making — was developed by a team led by Dennis Gaitsgory and Sam Raskin, and it's already drawing major attention in the math world and beyond.

As a physicist, what makes this especially fascinating is the unexpected bridge to quantum field theory. The same deep symmetry (S-duality) that shows up in the equations of electromagnetism and gauge theory also appears in the Langlands correspondence. Edward Witten and others have shown that what once seemed like abstract, esoteric math may actually reflect hidden structures in the fabric of physical law. In other words, this is not just beautiful mathematics — it might be a shadow of deeper symmetries in nature itself.

If there's interest — and people want to dive deeper or understand what this really means — let me know.
-Amber G.

[Prem Kumar]

Yes, please share. I have vaguely heard of the Langlands Programme. Would love to learn more, dumbed down, of course

[A_Gupta]

I will try to organize my thoughts. It would be help if I know two things.

1. Why do you ask how to generate problems
2. Your domain. My guess is that you are very good at engineering physics. I read on BRF that you took courses with Richard Feynman. Are you a physicist? You also have done course in ML at Stanford (online certificate). I heard it is a very tough course.

It is not necessary though.

I will unwind this once only, in the hope of getting gyaan from you and other members of this board.

1. These days, I dabble in stuff like https://projecteuler.net.

2. I want to see if generating problems that are tractable is a faster way to learning than solving problems. I believe that there are fundamental results in mathematics and physics that one must understand, not just "know of", for the good of one's soul; and my pace of learning is inadequate for the number of years likely left to me. Am seeking ways to speed it up.

3. A larger goal from which I have been distracted is to understand Paul Cohen's forcing and the independence of the Axiom of Choice and the Continuum hypothesis from conventional set theory. On the way Gödel's incompleteness theorems in their full technicality I have understood, but not yet with the grasp of fundamentals learned in my younger days.

4. As a graduate student, I and another worked for about six months with Feynman, but that research problem did not get anywhere.

5. Unless the Stanford credential is via Coursera, I must plead not guilty. I did do a lot of ML study, but it has decayed because where I am we are consumers of Ai models, not creators. (Incidentally, I once got a call from a debt collector, and after he satisfied himself that I was not the person he was looking for, he told me he had located 57 or so people with my name, so that might be source of confusion.)

6. My mathematical limitations you may guess from that I could never get very far or very interested in superstring theory, though I was resident at one of the centers of the first superstring revolution, and then a young aspiring physicist.

7. My work for many many years does not require mathematics or physics of any significance; what I have is what I am able to spend some time on.