Recent posts
Discover Elementary Number Theory
Just launched! A problem book for bright high school and college students. Written by Gaurav Bhatnagar, Ojas Kumar and Sagar Shrivastava. Published by Hem Aunty Publications.
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On Matters of the Heart
Introduction There is nothing like dodging a bullet to make you feel so good, that you want to wax philosophical with anyone and everyone. On Tuesday, May 5, 2026, I had gone for a regular checkup to Apollo; everything…
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Christian Krattenthaler — My role in him being the greatest.
Christian is the worlds greatest expert on determinants, and this blog post is about my role in him being the greatest! I attended Chirstian’s lectures of his course on Bijections given in the University of Vienna, during the period…
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What They Say about my teaching
This page is about my teaching ideas and the response of my students. Note that the comments are taken from the (anonymous) feedback I got. I have cherry picked the comments, so the reality of the courses may be…
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PhD Students (unofficial) — Archna and Surbhi
Sometime in the summer of 2019, I was back in India from my postdoc at Vienna, looking for jobs within India, and met my friend Amitabha Tripathi in his office in IIT, Delhi. At this time, Amitabha told me…
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Experience Mathematics
Just launched! A problem book for middle school and precalculus mathematics. Published by Hem Aunty Publications. They say that mathematics is learnt by doing mathematics. But for the middle school and high school level, there are very few books…
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A Linear algebra story.
A good bet to lose? This story is about my Linear Algebra course offered in Spring 2023, at Ashoka University, Sonipat.…
An uncountable number of proofs of the Pythagoras Theorem
Sagar Shrivastava (TIFR) and I have a new article, on proofs of Pythagoras Theorem. Sagar is finishing his PhD thesis under…
Dr. Sneh Raj – Sneh Mausi – Bua – Daadi – is no more.
My Mausi, Dr. Sneh Raj is no more. She died at age 91. She went on her own terms. She said…
Telescoping continued fractions
Krishnan Rajkumar (JNU) and I have a new preprint — on telescoping continued fractions. I have written previously on telescoping and…
Bhai Aditya Bir Singh — A Remembrance
June 2, 2021 Recently my wife and I were talking about what lunch we took to school. For the life of…
Andrews' approach to conjecture the Rogers-Ramanujan identities
If something is worth doing, then I suppose it is worth doing again. I had previously written an article on how…
Lest we forget them (Edited) – By P. K. Ghosh
An email Asoke and I sent with a link to P K Ghosh’s article “Lest we forget them”. I have previously…
Mummy's 90th birthday
My mother, Dr. Hem Bhatnagar, completed 90 years on October 28, 2019. We asked her family and friends if they wished…
Thank you, Dick
Howard Cohl and Mourad Ismail created a Liber Amicorum (Friendship Book) to present to Richard Askey. Askey is not well, and he…
On Entry II.16.12 of Ramanujan
Bruce’s Return gift: A daily reminder of Ramanujan In June, 2019, I attended a very inspiring conference, held at the University…
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Gaurav Bhatnagar 