|Fields||algebraic geometry, moduli spaces, Lie groups|
|Institutions||Institute of Mathematical Sciences, Chennai|
|Alma mater||Tata Institute of Fundamental Research, Mumbai|
|Doctoral advisor||M. S. Narasimhan|
|Notable awards||Shanti Swarup Bhatnagar Prize for Science and Technology|
S. (Sundararaman) Ramanan (born 20 July 1937) is an Indian mathematician who works in the area of algebraic geometry, moduli spaces and Lie groups. He is one of India's leading mathematicians and internationally recognised as an outstanding expert in Algebraic Geometry, especially in the area of modulii problems. He has also done some very beautiful work in Differential Geometry: His joint paper with M.S. Narasimhan on Universal Connections has been very influential: It enabled (among other things) S.S. Chern and B. Simons to introduce what is known as the Chern-Simons invariant which has proved useful in Theoretical Physics. He completed his PhD at the Tata Institute of Fundamental Research, under the direction of M. S. Narasimhan, with whom he collaborated for decades. He later pursued a lengthy career at TIFR, with many international visits. He picked up the methods of modern differential geometry from the French mathematician Jean-Louis Koszul, and later successfully applied it for his research centred around algebraic geometry. He has also made important contributions to the topics of abelian varieties and also vector bundles.
He was a senior colleague of M. S. Raghunathan and influenced him considerably. Vijay Kumar Patodi who proved part of the Atiyah-Singer index theorem, was found and encouraged by Ramanan, and Patodi's PhD was done under the combined direction of Narasimhan and Ramanan. He has a considerable number of students. Mathematicians influenced by Ramanan include N. Mohan Kumar, Shrawan Kumar, D. S. Nagaraj, Kapil H. Paranjape, Jaya Iyer, Annamalai Ramanathan and several others. He was very close to, and has closely collaborated with, many Western mathematicians of note, like the late Raoul Bott, who was at Harvard University. While in TIFR as distinguished professor, he was one of the important figures in the school of mathematics in India. He now continues his contributions via teaching at the Chennai Mathematical Institute, where he is adjunct professor. He is a great lecturer and expositor, and has written a graduate level book on Global Calculus. He is married to Anuradha Ramanan and has two daughters: Sumana Ramanan, who is a journalist and editor, now a senior editor at the Hindustan Times, Mumbai, and Kavita Ramanan, who is also a mathematician, now a professor at Brown University in Providence, Rhode Island, USA.
The honours awarded to prof. Ramanan include the Shanti Swarup Bhatnagar Prize in 1979, the Third World Academy of Sciences Prize for Mathematics in 2001 and the Ramanujan Medal. He has been a visiting professor at many leading universities in the world. In 1978 he gave one of the prestigious 50-minute invited talks at the International Congress of Mathematicians in Helsinki, and has also been a speaker at many major international conferences. In 1999, he was extended the privilege of speaking on some aspects of the work of André Weil, one of the greatest mathematicians of 20th century, on the occasion of his being awarded the prestigious Inamouri Prize. He is an alumnus of the Vivekananda College in Chennai.
- I. Biswas & S. Ramanan (1994). "An infinitesimal study of the moduli of Hitchin pairs". Journal of the London Mathematical Society 49 (2): 219–231. doi:10.1112/jlms/49.2.219.
- A conference in honour of S. Ramanan[dead link]
- Koszul, J.-L. Lectures on fibre bundles and differential geometry. With notes by S. Ramanan. Reprint of the 1965 edition. Tata Institute of Fundamental Research Lectures on Mathematics and Physics, 20. Published for the Tata Institute of Fundamental Research, Bombay; by Springer-Verlag, Berlin, 1986. viii+127 pp. ISBN 3-540-12876-X
- "S. G. Dani on M. S. Raghunathan" (PDF). Retrieved 12 January 2012.
- "Patodi biography". History.mcs.st-and.ac.uk. Retrieved 12 January 2012.
- "Homepage of N. Mohan Kumar". Math.wustl.edu. 10 August 2011. Retrieved 12 January 2012.
- "Shrawan Kumar homepage". Math.unc.edu. 12 June 1953. Retrieved 12 January 2012.
- "D. S. Nagaraj homepage". Imsc.res.in. 6 August 2005. Retrieved 12 January 2012.
- "Kapil H. Paranjape homepage". Imsc.res.in. 16 April 2004. Retrieved 12 January 2012.
- "Jaya Iyer Homepage". Imsc.res.in. 17 January 2008. Retrieved 12 January 2012.
- "Mathematical Genealogy of S. Ramanan". Genealogy.math.ndsu.nodak.edu. Retrieved 12 January 2012.
- "Chennai Mathematical Institute faculty page". Cmi.ac.in. Retrieved 12 January 2012.
- "A lecture of Ramanan at MSRI, Berkeley". Msri.org. Retrieved 12 January 2012.
- "AMS page on the book titled Global Calculus". Ams.org. Retrieved 12 January 2012.
- "Kavita Ramanan". Math.cmu.edu. Retrieved 12 January 2012.
- "List of Bhatnagar award recipients in mathematical sciences". Csir.res.in. Retrieved 12 January 2012.