Ekalavya, I(N)MO Camp, and Research Track

Hello mathematician!

The Indian National Math Olympiad is around the corner. Cheenta INMO Camp is in full swing now. There are five sessions every week. From Graph Theory to Geometric transformation, we are experiencing some high-caliber math-magic in our classrooms.

Find out more about I(N)MO Camp

We dream to train an IMO perfect-team one day. There has been only one such team in the history of International Math Olympiad: 1994 US Team. There were a record-breaking six perfect scores that year in Hong Kong that year.

Then there are bigger dreams. We wish to facilitate world-class research in mathematical science in our soil. This is indeed Cheenta's long-term vision. Recently we launched the Research-Track program. It is a unique program for advanced school and college students who wish to pursue research early on.

Many of the Cheenta alumni and faculty members are engaged in world-class research at leading universities around the world. We have students in Oxford, UIUC, Edinburgh, I.S.I., TIFR, UT Austin, M.I.T., to name a few places. More importantly, we make it a point to keep in touch with these bright people over the years. They often advise our existing students, conduct seminars. or teach courses. For example one of our existing students had an interview at Oxford (for B.Sc. program) last week. We could easily create an advising cum mock interview session with the help of our alumni at Oxford.

This growing network of bright alumni spread over several continents is indeed one of Cheenta's greatest strengths.

Learn more about Research Track

Yesterday I read a frightening news. A young girl committed suicide as she was forced to leave school and work at a Biri factory. The reporter wrote, 'the girl loved to learn. She went into depression when she was forced to leave school due to economic pressure.'

We should all feel responsible for this incident. It is our collective sin.

EklavyaCheenta has Ekalavya Scholarship program. We give a full tuition waiver to deserving economically challenged students. Not only that, we award a small stipend for other expenses as well.

Today I urge you to be an ambassador of Cheenta's Ekalavya program. if you know even one kid who is talented but limited by resources, help him/her to find Cheenta. Every life counts!

An exciting week lies ahead of us. Here is the timetable:

Cheenta Mains _ December 17 - 23 - Schedule

Regards,

Ashani Dasgupta
Cheenta

Passion for Mathematics

Work of the giants

Hello mathematician!

I am working my way through a curious monologue: Groups acting on Graphs (by Dicks & Dunwoody). Dunwoody is one of the giants of Group Theory and low dimensional topology. His style of writing is reminiscent of Serre (another stalwart in this field). Dunwoody's algebra is clean, notations and definitions are exhaustive and examples are abundant.

Dunwoody reminds me of classical texts in Euclidean geometry where one would painstakingly make ner way through axioms, definitions, and theorems in a sequential manner. This trend of writing mathematics was rekindled by Bourbaki in the last century.

clairaut
Alexis Claude Clairaut

There is another trend of 'writing' mathematics. This can be loosely described as the 'populist' method. Its roots can be traced back to French mathematician Alexis Claude Clairaut. His book on geometry (Elements de Geometrie, 1741) was a clear departure from medieval geometry texts. The rule of the day was to mention all axioms, definitions, and theorems in a deductive continuity.

Clairaut did not care about this 'rigor'. He would quickly enter realms of 'reality' after loosely describing the initial ideas. For example, he would quickly move to the descriptions of Canal engineering, from the definition of parallel lines.

Some historiographers of mathematics are of the opinion that this departure from rigor actually led to the discovery of non-euclidean geometry. If this is true, then it would earmark one of the most astounding connections between reality and abstraction.

This style of writing was later adopted by other giants of mathematics. Two of the absolute masterpieces of this genre are:

Both of these works quickly move from 'initial ideas' to 'applications' and 'examples'. However, these applications and examples are more mathematical in nature (compared to canal engineering). Both authors are not worried about 'taking care of all initial ideas' before they embark upon the exciting mathematical expedition. They freely use 'rigorously unexplained' words and concepts.

This is in stark contrast to what Dunwoody does in his work.

Some authors have taken a 'middle path'. Recently Dr. Chakraborty's Real Analysis (in Bengali) is an example to the point. It has a more conversational and expositional temper though he is careful enough to maintain 'completeness'. Hatcher's Algebraic Topology does something similar. Excursion into Mathematics (Beck, Crowe, and Bleicher) is yet another example from pre-college mathematics.

Personally, I am unsure about my preference. Though the informal tone of Hilbert and Thurston is more inviting in the beginning, one quickly seeks more rigor to reaffirm one's own theoretical understanding of the subject. One should probably work hard on a rigorously presented idea and keep an informal masterpiece as an interlude in ner journey.

This week we hope to see you in classes. We have some beautiful formal and informal adventures in mathematics waiting for you.

Cheenta Weekly Schedule - December 10 to 16, 2018

All the best!

Ashani Dasgupta
Cheenta Team

Passion for mathematics.

Connecting the dots, from geometry to combinatorics and more

Hello mathematician!

I was playing with a square. What if I glue the opposite edges of the square?

square

If I glue one pair of edges, we get a cylinder. (Ah! Are you wondering about the rules of ‘gluing’?)

Also see:

Festival of mathematics at Cheenta this week

Or: Download the PDF of this week's schedule

Next, if we glue the two ends of that cylinder we may get a torus or a Klein bottle (depends on how we glue them). This discussion came up in one of our sessions. We wondered about the essence of this ‘gluing’ process.

Once we decide on the rule of gluing, we declare the glued points to be equivalent and get cylinder, torus, Klein bottle at various stages of the process.

Notice that we have so many things happening at the same time:

At once we are prompted to connect geometry and combinatorics. 

Solving problems is one thing. Connecting seemingly different ideas is an entirely different business (though they have dependencies). It is extremely important to pause and let our imagination do its magic every now and then.

In this context let me quote two of the greatest minds of our times.

William_ThurstonThurston in Clay Research Conference (2010), started off with a very curious statement:

“A lot of mathematics is really about how you understand things in your head… we are not just general purpose machines, we are people, we see things, we feel things, we think of things,…, there is something significant about how the representations in your head, changes … profoundly changes how you think.”

Thurston drew different pictures (of 3-manifolds) than what his peers did. That is because he imagined things differently. And he was brave enough to follow his own imagination. It takes courage to not to parrot what the ‘system’ is teaching you.

It takes courage to let your imagination guide you. This is especially true in this age of rat race.

RabindranathRabindranath writes in Jibansmriti,

“বাহিরের সংস্রব আমার পক্ষে যতই দুর্লভ থাক্‌, বাহিরের আনন্দ আমার পক্ষে হয়তো সেই কারণেই সহজ ছিল। উপকরণ প্রচুর থাকিলে মনটা কুঁড়ে হইয়া পড়ে; সে কেবলই বাহিরের উপরেই সম্পূর্ণ বরাত দিয়া বসিয়া থাকে, ভুলিয়া যায়, আনন্দের ভোজে বাহিরের চেয়ে অন্তরের অনুষ্ঠানটাই গুরুতর। শিশুকালে মানুষের সর্বপ্রথম শিক্ষাটাই এই। তখন তাহার সম্বল অল্প এবং তুচ্ছ, কিন্তু আনন্দলাভের পক্ষে ইহার চেয়ে বেশি তাহার কিছুই প্রয়োজন নাই। সংসারে যে হতভাগ্য শিশু খেলার জিনিস অপর্যাপ্ত পাইয়া থাকে তাহার খেলা মাটি হইয়া যায়।”

Rabindranath was skeptic about ‘external tools’. Even in his other works in literature and pedagogy, this theme is iterated over and over again: let your internal imagination bring in happiness. Do not worry too much about the tools.

Pause for a moment, Look outside the window. Even the sun does not rise at the same position in the eastern horizon.

Ashani Dasgupta

Passion for Mathematics

Homework, Duality, Euler Number and Cheenta this week!

Hello mathematician!

I do not like homework. They are boring ‘to do’ and infinitely more boring to ‘create and grade’. I would rather read Hilbert’s ‘Geometry and Imagination’ or Abanindranath’s ‘Khirer Putul’ at that time.

Academy Award winner Michael Moore, Rabindranath Tagore and Finland’s educators (who have the number 1 education system for school students) are some other people who do not like homework. I am pretty sure that Lalon Fakir did not like it either, though I do not evidence to back up this claim.

Here is a short documentary on why you should never do your homework (ehm..), climb a tree instead of going to school and play all the time.

Naturally, you might wonder that if not ‘assignments’ and ‘exams’ then what? What is it that you should do beyond school and tutorial hours to master your trade? After all, you really like mathematics (otherwise you would not be in Cheenta in the first place).

find a beautiful book

One thing that you could do is, ask your teacher for a beautiful book/resource that has inspired ner to do mathematics. Then run to local bookstore or library to find that book. Try it on your own. You may or may not like it. If you do, then try to rigorously work through that resource.

Here is one book that I find intriguing and am using in one of my courses: Geometry Revisited by Coxeter.

geometry revisited

And while we are on it, why don’t you also look into Coxeter Groups. They are fantastic extensions of the idea of reflection.

one beautiful problem to keep your brain busy

There is another thing that I do all the time (and found very useful). Keep your brain busy with a couple of beautiful problems. Carry a small notebook and scribble in it new ideas and perspectives on these problems. Here are two problems that are keeping me busy right now.

  1. The Gromov Boundary of one-ended hyperbolic groups is locally connected! (Bestvina is so cool!)
  2. Is there a thing called parallel groups? How about amalgamating a bunch of groups about common beads and defining an action of those vertex groups on embeddings of [0,1] in a metric space that leads to non-intersecting foliations?

This week, we have some brilliant adventures in mathematical science in store for the classes.

  • Stirling Numbers are hard to compute. We look into some recursions that lead to them.
  • Duality is everywhere. We explore its omnipresence in the context of linear functions and platonic solids.
  • Infinite sequences are very useful to understand finite numbers. Madhavacharya of Kerala did some fantastic work on this. Swiss mathematician Euler also used it all the time. We will expand on our previous investigations of infinite sequences to understand one of the most beautiful constants of mathematics: the Euler Number.
  • Graph and Number Theoretic Algorithms will be examined in our Computer Science Program (did you watch Alan Turing’s life story? Google it). Pierre De Fermat has intrigued mathematicians for centuries. This civil servant from France created some of the most interesting musings in mathematics. We explore his little theorem (and while you are on it google Fermat’s Last Theorem).
  • From Fermat’s Number Theory to Felix Klein’s weird bottle, we have a festival of mathematics in store for you.

Remember to have some serious fun!

Here is the weekly schedule:

This Week

Ashani Dasgupta

Passion for Mathematics