His older brother was the mathematician C.T. Rajagopal and his younger brother was the philosopher C.T.K. Chari.
He showed that the series for tan1x discovered by James Gregory and those for sin x and cos x discovered by Isaac Newton were known to the Hindu mathematicians 150 years earlier.
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Rajagopal conducted research on sequences, series, summability and , and published more than 80 papers but is most noted for his work in the area of generalising and unifying Tauberian theorems.
Lagadapati Rajagopal | K. Rajagopal | Cadambathur Tiruvenkatacharlu Rajagopal | V. D. Rajagopal IAS | Rosalind Rajagopal | Rajagopal Muthukumaraswamy |