Subbaramiah Minakshisundaram

Subbaramiah Minakshisundaram ( born October 12, 1913 in Trichur; † August 13, 1968 in Kerala ) was an Indian mathematician.

Minakshisundaram received his doctorate at the University of Madras, where he was a student of K. Ananda Rau. After that, he taught for a while privately (on the mediation of the Jesuit mathematician and C. Racine ( 1897-1976 ) ) before he became a lecturer at the Andhra University. 1946 to 1948 he was invited by Marshall Stone at the Institute for Advanced Study, and then a professor at the Andhra University.

Mikashisundaram dealt as a student of Rau ( in turn a student of Godfrey Harold Hardy was ) first with summability of Dirichlet series and eigenfunction developments, ie the topics also pursued Hardy at Cambridge and Oxford. Through the influence of Racine and MR Siddiqui ( later President of Pakistan Academy of Sciences, who was a pupil of Leon Lichtenstein ), he began to be interested in the initial value problem of parabolic partial differential equations. At Princeton he led in collaboration with the Swedish mathematician Åke Pleijel (1913-1989) in 1949, named after two zeta function, constructed from the eigenvalues ​​of the Laplace equation on compact Riemannian manifolds and they recognized the relationship with solutions of the heat equation (heat kernel).

With K. Chandrasekharan he conducted research on the analytical properties of the Riesz means with applications to multiple Fourier series.