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|K. G. Ramanathan|
13 November 1920|
Hyderabad, British India
10 May 1992 (aged 71)|
|Alma mater||Princeton University|
|Doctoral advisor||Emil Artin|
C. P. Ramanujam|
Kollagunta Gopalaiyer Ramanathan (13 November 1920 – 10 May 1992) was an Indian mathematician known for his work in number theory. His contributions are also to the general development of mathematical research and teaching in India.
K. G. Ramanathan was born in Hyderabad in South India. He completed his B.A. and M.A. in mathematics at Osmania University and the University of Madras respectively before going to Princeton to earn his Ph.D; his advisor was Emil Artin. At Princeton, Ramanathan also worked with Hermann Weyl and Carl Siegel. Thereafter he returned to India to team up with K. Chandrasekharan at the Tata Institute of Fundamental Research (TIFR) at Colaba in 1951. At Princeton, for about two years, Ramanathan's neighbour was Albert Einstein, legendary physicist. He used to sing Carnatic songs of Thyagaraja to Einstein for entertainment.
Ramanathan was married to Jayalakshmi Ramanathan. He is survived by two sons. His father's name was Kollagunta Gopal Iyer, and his mother's name was Ananthalaxmi. His mother died at an early age. He had two sisters and one brother.
At TIFR, he built up the number theory group of young mathematicians from India. For several years, he took interest to study Ramanujan's unpublished and published work. He was an Editorial board member of Acta Arithmetica for over 30 years. He retired from TIFR in 1985.
Ramanathan was given numerous achievements during his more than 30 years service at TIFR.