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{{Short description|Indian mathematician (1913–1968)}}
{{Use dmy dates|date=January 2019}}
{{Use British English|date=January 2019}}
{{Infobox person
| name = Subbaramiah Minakshisundaram
| image = Subbaramiah Minakshisundaram.jpg
| caption = Minakshisundaram in 1940
| birth_date = 12 October 1913
| birth_place = Trichur, Kerala State, India
| death_date = 12 August 1968
| death_place = Visakhapatnam, Andhra Pradesh, India
| other_names = Minakshi, SMS, Jeja
| occupation = Mathematician
| years_active = 1936 - 1968
| known_for = [[Minakshisundaram–Pleijel zeta function|Minakshisundaram-Pleijel zeta function]]
}}
'''Subbaramiah Minakshisundaram''' (12 October 1913 - 13 August 1968), also known as Minakshi or SMS, was an Indian mathematician who worked on [[partial differential equation]]s and [[heat kernel]]s. In 1946, he worked at the [[Institute for Advanced Study]] in Princeton, America, where he met [[Åke Pleijel]]. In 1949, the two wrote a paper together called, ''Some properties of the eigenfunctions of the Laplace-operator on [[Riemannian manifold]]s'', in which they introduced the [[Minakshisundaram–Pleijel zeta function|Minakshisundaram-Pleijel zeta function]].<ref name=":0">{{Cite web |title=Subbaramiah Minakshisundaram - Biography |url=https://mathshistory.st-andrews.ac.uk/Biographies/Minakshisundaram/ |access-date=2023-03-31 |website=Maths History |language=en}}</ref><ref>{{Cite web |date=2016-07-04 |title=FROM THE EDITOR' S DESK « |url=http://minakshisundaram.org/memorial-journals/from-the-editor-s-desk/ |access-date=2023-04-03 |archive-url=https://web.archive.org/web/20160704014355/http://minakshisundaram.org/memorial-journals/from-the-editor-s-desk/ |archive-date=4 July 2016 }}</ref><ref name=":1" />

On the 13th of August 1968, Subbaramiah suffered a heart attack and died at the age of 55.

== Biography ==

=== Early life ===
Subbaramiah Minakshisundaram was the first of three children, born in 1913 and called "Jeja" by his parents, meaning God. In his early years he learned [[Malayalam]], but when his family moved to Chennai because of his father's job as a sanitary engineer they spoke [[Tamil language|Tamil]].<ref name=":0" />

His family were Hindus, and as a boy Minakshisundaram would chant the [[Gayatri Mantra|Gayatri Japa]] and perform the [[Sandhyavandanam]] with his grandfather every morning and night.<ref>{{Cite web |title=Episodes in Minakshisundaram's life |url=https://mathshistory.st-andrews.ac.uk/Extras/Minakshi_life/ |access-date=2023-03-31 |website=Maths History |language=en}}</ref>

In 1919, Minakshi attended the [[Calavala Ramanujam Chetty High School]], where he displayed a "marked aptitude" for mathematics, and graduated in 1929 with a Secondary School Leaving Certificate. After graduating, he studied at Pachaiyappa's College and went to Loyola College in 1931 to pursue a B.A. in mathematics, which he attained in 1934.

=== Career ===
After graduating from Loyola College, Subbaramiah joined the [[University of Madras]] as a research scholar and worked in the library.<ref name=":1">{{Cite journal |last=Thangavelu |first=S |date=January 2003 |title=S Minakshisundaram: A glimpse into his life and work |url=http://link.springer.com/10.1007/BF02834449 |journal=Resonance |language=en |volume=8 |issue=1 |pages=41–50 |doi=10.1007/BF02834449 |s2cid=121735864 |issn=0971-8044|url-access=subscription }}</ref>

During his time at the University of Madras, Minakshi was influenced by [[K. Ananda Rau|K Ananda Rau]], and began studying the summability of [[Series (mathematics)|series]]. His first paper, ''Tauberian theorems on Dirichlet's series'', was published in 1936 and expanded upon Rau's theorem. He followed this with two papers, both published in 1937: ''On the extension of a theorem of Caratheodory in the theory of Fourier series'', and, ''The Fourier series of a sequence of functions''.<ref name=":0" />

=== Marriage ===
On the 10th of May, 1937, Minakshisundaram married M Parvathi. They had three children together:

* K Ramu (born 1943)
* K Girija (born 1945)
* K Radha (birthdate unknown)<ref name=":0" />

==Publications==

* Minakshisundaram, S., & Szasz, O. (1947). On Absolute Convergence of Multiple Fourier Series. ''Transactions of the American Mathematical Society'', ''61''(1), 36–53. <nowiki>https://doi.org/10.2307/1990288</nowiki>
* Minakshisundaram, S., & Pleijel, Å. (1949). Some Properties of the Eigenfunctions of The Laplace-Operator on Riemannian Manifolds. ''Canadian Journal of Mathematics,'' ''1''(3), 242-256. {{doi|10.4153/CJM-1949-021-5}}
* Minakshisundaram, S. (1949). A Generalization of Epstein Zeta Functions. ''Canadian Journal of Mathematics,'' ''1''(4), 320-327. {{doi|10.4153/CJM-1949-029-3}}
* Minakshisundaram, S., Chandrasekharan, K. (1952). Typical Means. India: Tata Institute of Fundamental Research, Bombay.
* Minakshisundaram, S. (1953). Eigenfunctions on Riemannian Manifolds. ''The Journal of the Indian Mathematical Society'', ''17''(4), 159–165
* Chandrasekharan, K., & Minakshisundaram, S. (1954). A Note on Typical Means. ''The Journal of the Indian Mathematical Society'', ''18''(1), 107–114

=== Posthumous works ===

* Minakshisundaram, S. (2012). Collected Works of S. Minakshisundaram. India: Ramanujan Mathematical Society.

==References==
{{Reflist}}

==External links==
* [http://minakshisundaram.org/sms-memorial-society/ S. Minakshisundaram memorial society]

{{Authority control}}

{{DEFAULTSORT:Minakshisundaram, Subbaramiah}}
[[Category:1913 births]]
[[Category:1968 deaths]]
[[Category:20th-century Indian mathematicians]]
[[Category:Scientists from Kerala]]

{{Asia-mathematician-stub}}

Subbaramiah Minakshisundaram - Revision history

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