CP Ramanujam

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Chidambaram Padmanabhan Ramanujam , mostly cited CP Ramanujam, ( Tamil சி.பி. ராமானுஜம் ; * January 9, 1938 in Madras ; † October 27, 1974 in Bangalore ) was an Indian mathematician who dealt with algebraic geometry and number theory .

R. Narasimhan described him as one of the strongest mathematical talents that India produced in the second half of the 20th century, equally at home in classical mathematical analysis and in abstract algebraic geometry of the school of Alexander Grothendieck , in analytical and algebraic number theory.

Ramanujam studied at Loyola College in Madras, where the mathematician and Jesuit C. Racine promoted him. In 1957 he was admitted to the Tata Institute of Fundamental Research . His fellow students at the time were Raghavan Narasimhan , with whom he was friends and had attended school, and S. Ramanan . There he heard, among other things, Max Deuring's lectures on algebraic function bodies, which he worked out. He received his doctorate in number theory at KG Ramanathan in 1967 . Before that, he had solved a problem from Carl Ludwig Siegel (one of the examiners for his dissertation) by showing that cubic forms in 54 variables have at least one nontrivial solution over every algebraic number field . He also made progress in connection with the Waring problem over algebraic number fields. Because of these achievements, he became an Associate Professor at the Tata Institute even before his doctorate. He also prepared lecture notes for the lectures of Igor Schafarewitsch (Algebraic Surfaces) in 1965 and David Mumford (Abelian Varieties) in 1967 at the Tata Institute, also improving the evidence.

He was invited by Mumford to Harvard and by Grothendieck to Paris and was also briefly in Paris. In 1964 he was diagnosed with schizophrenia . He went back to Madras and left the Tata Institute in 1965 to become a professor in Chandigarh , but then returned to the Tata Institute. As a result, outbreaks of the disease alternated with periods of mathematical activity. For example, he was invited by Mumford as a visiting professor at the University of Warwick for a year when there were algebraic geometry courses, and he was visiting professor in Turin. In 1972 he proved a variant of Kunihiko Kodaira's vanishing theorem , which specifies conditions for the vanishing of the first coherent groups of coherent sheaves on surfaces, and the topological invariance of Milnor numbers. Attempts were made to keep him at the Tata Institute and, at his own request, he went to the Department of Applied Mathematics in Bangalore. In 1974 he took his own life on sleeping pills during one of his depressive phases.

He was a Fellow of the Indian Academy of Sciences (1973).


  • CP Ramanujam- a tribute, Springer Verlag 1978 (contributions by S. Ramanan, David Mumford, KG Ramanathan et al.)

Web links

Individual evidence

  1. ^ Raghavan Narasimhan The coming of age of mathematics in India , in Michael Atiyah et al. a. Miscellanea Mathematica , Springer Verlag 1991, p. 257
  2. Lectures on Minimal models and birational transformations of two dimensional schemes