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{{Short description|Indian mathematician}}
{{Use dmy dates|date=September 2019}}
{{Use Indian English|date=September 2019}}
'''Puliyakot Keshava Menon''' (1917 – 22 October 1979) was an Indian [[mathematician]] best known as Director of the [[Joint Cipher Bureau]].<ref>Puliyakot Kesava Menon (1917–1979) (Bull. Math. Assoc. India 18 (1986), no. 1–4, 21–24)</ref>

His sudden demise on 22 October 1979, ended active research in the areas of [[number theory]], [[combinatorics]], algebra and [[cryptography]].

==Early life==

P. Kesava Menon was born (1917) in Alathur, which is now part of the Palakkad District of Kerala state in [[India]]. His mother, Devaky Amma, hailed from the Kunissery Puliyakot family and, as per custom, Kesava Menon took his family name from his mother. His father, A K Krishnan Unni Kartha, hailed from Aiyiloor in the Palghat district. Menon grew up on Alathur under his uncle's supervision and hence his primary and high school education was conducted in modest surrounding at Alathur itself.

==Higher education==
As was the custom for bright students from landed families those days, Menon had to travel to Madras city and join the [[Madras Christian College]] for his higher studies. There, he completed his MA in Mathematics and was awarded a scholarship to pursue research under the guidance of Prof R Vaidyanathaswamy. In 1941, the [[University of Madras]] awarded him a MSc Degree with a thesis entitled "Contributions to the theory of multiplicative arithmetic functions".

==Educator==
Thereafter he was appointed lecturer at the [[Annamalai University]], where he served for two years, before joining the staff of Madras Christian College again as a professor and warden of Seliyur Hall. He was devoted to his research work along with teaching, and, in 1948, he submitted his dissertation on "Contributions to the theory of numbers" for which he was conferred the highest and rarest degree of Doctor of Science (DSc).

He theorized and published the classical inequality theory, which is today known as "Kesava Menon's classical inequality theorem"<ref>http://www.ingentaconnect.com/content/klu/jcaa/2001/00000003/00000002/00229059</ref>

He published a paper on the subject of the continued fraction of the mathematician [[Ramanujan]], as noted here in the Journal of the London Mathematical Society<ref>[https://archive.today/20120710192956/http://jlms.oxfordjournals.org/cgi/content/citation/s1-40/1/49 ]</ref><ref>{{Cite book | url=https://books.google.com/books?id=jbTbVoKP66IC&q=Kesava.Menon+Ramanujam&pg=PA155 |title = Ramanujan's Notebooks|isbn = 9780387961101|last1 = Berndt|first1 = Bruce C.|date = March 1985}}</ref>

==See also==
*[[Regular Hadamard matrix|Menon design]]
*[[Arithmetic function#Menon.27s identity|Menon's identity]]

==References==
{{reflist}}

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{{DEFAULTSORT:Menon, P. Kesava}}
[[Category:People from Palakkad district]]
[[Category:1917 births]]
[[Category:1979 deaths]]
[[Category:Annamalai University faculty]]
[[Category:20th-century Indian mathematicians]]
[[Category:Scientists from Kerala]]
[[Category:Indian number theorists]]

P Kesava Menon - Revision history

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