Komanamana Sankaranarayanan Subramonian Nambooripad, Indian mathematician (Puttumanor, Ernakulam District, Kerala State 06 April 1935 – Thiruvanathapuram, Kerala State 04 January 2020) Characterised axiomatically the structure of the set of idempotents in a regular semigroup (1979) Developed an alternative approach to describe the structure of regular semigroups Developed the concept and terminology of a biordered set (1970s) EPONYMY Nambooripad structure theorem for regular semigroups HartwigNambooripad partial order (1980) EhresmannScheinNambooripad theorem

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