Tirukkannapuram Vijayaraghavan

|death_date = |occupation = mathematician }} 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 a_n>0 :\sqrt{a_1 + \sqrt{a_2 + \sqrt{a_3 + \sqrt{a_4 + \cdots}}}} converges if and only if :\overline{\lim} (\log a_n)/2^n < +\infty, where \overline{\lim} denotes the limit superior. Provided by Wikipedia
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