Tirukkannapuram Vijayaraghavan
Tirukkannapuram Vijayaraghavan (; 30 November 1902 – 20 April 1955) was an Indian mathematician from the Madras region. He worked with G. H. Hardy when he went to Oxford in mid-1920s on Pisot–Vijayaraghavan numbers. He was a fellow of Indian Academy of Sciences elected in the year 1934. His father was a pandit. Vijayaraghavan was well versed in Sanskrit and Tamil. He was a close friend of André Weil. Weil hired him in 1930 despite his lack of diploma, and they served together in Aligarh Muslim University. While Weil was away in Europe, Ross Masood planned to replace Weil's professorship with Vijayaraghavan, but Vijayaraghavan quit in protest and moved to the University of Dhaka. Vijayaraghavan proved a special case of Herschfeld's theorem on nested radicals: For 

converges if and only if

where  denotes the limit superior. References

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Academic staff of Aligarh Muslim University
20th-century Indian mathematicians
Fellows of the Indian Academy of Sciences
1902 births
1955 deaths
Scientists from Chennai
Expatriates from British India in the United Kingdom