These factors are called the " convergence factors " of the variations, which are useful for analyzing the rate of convergence.
2.
His works, published in " Proceedings of the London Mathematical Society ", were " Density integration " ( 53, 1951 ); " On the measure of sum sets ( I ) The theorems of Brunn, Minkowski, and Lusternik, ( with A . M . McBeath ) " ( [ 3 ] 3, 1953 ); " Linear functions with domain a real countably infinite dimensional space " ( [ 3 ] 5, 1955 ); " Linear and bilinear functions with domain contained in a real countably infinite dimensional space " ( [ 3 ] 6, 1956 ); " The use of convergence factors in Ward integration " ( [ 3 ] 10, 1960 ); " The equivalence of generalized forms of the Ward, variational, Denjoy-Stieltjes, and Perron-Stieltjes integrals " ( [ 3 ] 10, 1960 ); " N-variation and N-variational integrals of set functions " ( [ 3 ] 11, 1961 ); " Definitions of Riemann type of the variational integrals " ( [ 3 ] 11, 1961 ); " Difference-sets and the Banach Steinhaus theorem " ( [ 3 ] 13, 1963 ); " Generalized integrals of vector-valued functions ( [ 3 ] 19 1969)
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