The theory of approximation, by Dunham Jackson. Approximation, The theory of. Jackson, Dunham, 1888-1946. Numerical analysis. QA221 .J3 512.22 JAT "Some parts [of the present work] have been published previously, in my thesis, in various articles in the Transactions of the American mathematical society, and elsewhere."--Pref. New York, The American mathematical society, 1930. 1930. 1930 Text viii, 178 p. ; eng American mathematical society. Colloquium publications, Vol. XI