Suresh Govindarajan
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313 followers
Suresh's posts
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Continuing something I started last year, I am raising funds for the NGO V-Excel Educational Trust as a part of my run at the Wipro Chennai Marathon this year. Please donate and let me achieve my target of getting at least 100 donors to this cause.

V-Excel Educational Trust was established in the year 2002 and their beneficiaries include children and young adults with Autism, Asperger’s Syndrome, Mental Retardation, Attention Deficit Disorders (ADD/ADHD), Down’s syndrome, Specific Learning Disabilities, physical disabilities and the like.﻿
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The detection of gravitational waves:
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The following notes are a transcription and a translation into English of lecture notes (192 pages!) of de Bruijn's course on combinatorics, originally given in the 70s and 80s:

http://goo.gl/ZXO5AV

you may be surprised where they are hosted. From the introduction:

Combinatorics is mainly about counting. The nice thing about counting is that you learn something about the thing that you are counting. While counting, you notice that your knowledge about the subject is not sufficiently precise, and so counting becomes an educational activity. When two sets have the same number of elements, you try to understand why that is the case by establishing some natural bijection between the two.
N. G. de Bruijn recalls that sometime around 1975, he counted the number of a certain type of logics with three variables. There were a lot of them; some number with 14 digits. A little while later he saw an article that was about something completely different, but it concluded that the number of those objects was exactly that same number with 14 digits. He got curious and read the article very carefully. Indeed, if you thought deeply about it you could see that you could interpret those objects also as logics.

(via darij grinberg on MathOverflow)﻿
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There is going to be an announcement on Feb 11 (http://www.ligo.org/news/media-advisory.php) on the direct detection of gravitational waves by LIGO. Rumour has it that they have seen the merger of two large black holes into one large black hole plus a huge amount of energy released via gravitational waves. Indirect evidence for gravitational waves was first shown by Hulse and Taylor in 1974 for which they received the Nobel prize in 1993 (http://www.nobelprize.org/nobel_prizes/physics/laureates/1993/). This is big news and opens the door into a an era of "gravitational telescopes".  ﻿
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Meet Ravi Jagadeesan, an American of Indian origin. He is a gold medalist at the International Mathematical Olympiad in 2012 and is currently a student at Harvard. He just put a paper on the math arXiv: http://arxiv.org/abs/1601.05070﻿
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This year I have added a new twist to my annual run at The Wipro Chennai Marathon . I am running to raise money for Vidya Sagar. The precise amount that you wish to donate is not relevant. I just would like a lot of people to donate. Click on this link and you will be directed to a page where you can donate.﻿
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Kaveri Trail Marathon 2015: I ran the HM in 2:01:20.﻿
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(Infinite dimensional) Linear Algebra for the mathematically oriented physicist. I have been on the lookout for a book that has a nice introduction to Hilbert spaces -- chapter one does that. ﻿