As an Integration theorist , he is notable for Henstock -- Kurzweil integral .
Ralph Henstock ( 2 June 1923 -- 17 January 2007 ) was an English mathematician and author .
As an Integration theorist , Ralph Henstock is notable for Henstock -- Kurzweil integral .
Ralph Henstock ( 2 June 1923 -- 17 January 2007 ) was an English mathematician and author .