Tirukkannapuram Vijayaraghavan (Tamil

Tamil language

Tamil is a Dravidian language spoken predominantly by Tamil people of the Indian subcontinent. It has official status in the Indian state of Tamil Nadu and in the Indian union territory of Pondicherry. Tamil is also an official language of Sri Lanka and Singapore...

: திருகண்ணபுரம் விஜயராகவன் 30 November 1902 - 20 April 1955) was an India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

n mathematician from Madras region. He worked with G. H. Hardy

G. H. Hardy

Godfrey Harold “G. H.” Hardy FRS was a prominent English mathematician, known for his achievements in number theory and mathematical analysis....

 when he went to Oxford

Oxford

The city of Oxford is the county town of Oxfordshire, England. The city, made prominent by its medieval university, has a population of just under 165,000, with 153,900 living within the district boundary. It lies about 50 miles north-west of London. The rivers Cherwell and Thames run through...

 in mid-1920s on Pisot-Vijayaraghavan number

Pisot-Vijayaraghavan number

In mathematics, a Pisot–Vijayaraghavan number, also called simply a Pisot number or a PV number, is a real algebraic integer greater than 1 such that all its Galois conjugates are less than 1 in absolute value. These numbers were discovered by Axel Thue in 1912 and rediscovered by G. H. Hardy in...

s. He was a fellow of Indian Academy of Sciences

Indian Academy of Sciences

The Indian Academy of Sciences, Bangalore was founded by Sir C. V. Raman, and was registered as a Society on 24 April 1934. Inaugurated on 31 July 1934, it began with 65 founding fellows. The first general meeting of Fellows, held on the same day, elected Professor Raman as President, and adopted...

 elected in the year 1934.

Vijayaraghavan was well versed in Sanskrit and Tamil, the only son of famous upanyasaka tirukkannapuram Pattappa Swamy. Pattappa Swamy, to this day, is considered to be one of the most important personalities in sri vaishnavam or ramanuja

Ramanuja

Ramanuja ; traditionally 1017–1137, also known as Ramanujacharya, Ethirajar , Emperumannar, Lakshmana Muni, was a theologian, philosopher, and scriptural exegete...

 sampradayam in the 20th century. Vijayaraghavan was a close friend of André Weil

André Weil

André Weil was an influential mathematician of the 20th century, renowned for the breadth and quality of his research output, its influence on future work, and the elegance of his exposition. He is especially known for his foundational work in number theory and algebraic geometry...

. He served with him in Aligarh Muslim University

Aligarh Muslim University

Aligarh Muslim University ,is a residential academic university, established in 1875 by Sir Syed Ahmed Khan as Mohammedan Angelo-Oriental College and later granted the status of Central University by an Act of the Indian Parliament in 1920...

. He later shifted to University of Dhaka

University of Dhaka

The University of Dhaka is the oldest university in Bangladesh. It is a multi-disciplinary research university and is among the top universities in the region. Established on July 21, 1921, as per the Government of India Act, 1920, it was modelled on the Universities in England and soon gained...

, protesting Weil's firing from AMU.

Vijayaraghavan proved a special case of Herschfeld's theorem on nested radicals:
converges if and only if

External links