|Born||30 September 1775
Carrickfergus, County Antrim, Ireland
|Died||10 August 1843
New Brunswick, New Jersey, USA
University of Pennsylvania
|Known for||Least squares method|
Robert Adrain (30 September 1775 – 10 August 1843) was an Irish mathematician, whose career was spent in the USA. He was considered one of the most brilliant mathematical minds of the time in America, during a period when few academics conducted original research. He is chiefly remembered for his formulation of the method of least squares.
He was born in Carrickfergus, County Antrim, Ireland, but left Ireland after being wounded in the failed uprising of the United Irishmen in 1798 and moved to Princeton, New Jersey. He taught mathematics at various schools in the United States. He was president of the York County Academy in York, Pennsylvania, from 1801 to 1805.
He is chiefly remembered for his formulation of the method of least squares, published in 1808. Adrain certainly did not know of the work of C.F. Gauss on least squares (published 1809), although it is possible that he had read A.M. Legendre's article on the topic (published 1806).
Adrain was an editor of and contributor to the Mathematical Correspondent, the first mathematical journal in the United States. Later he twice attempted to found his own journal, The Analyst, or, Mathematical Museum, but in both the 1808 and 1814 attempts it did not attract sufficient subscribers and quickly ceased publication. He was elected a Fellow of the American Academy of Arts and Sciences in 1813. In 1825 he founded a somewhat more successful publication targeting a wider readership, The Mathematical Diary, which was published through 1832.
Adrain, Gauss, and Legendre all motivated the method of least squares by the problem of reconciling disparate physical measurements; in the case of Gauss and Legendre, the measurements in question were astronomical, and in Adrain's case they were survey measurements.
Adrain was the father of Congressman Garnett B. Adrain. Robert Adrain died in New Brunswick, New Jersey. He is commemorated by a blue plaque, unveiled at Carrickfergus by the Ulster History Circle.
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