Some special cases of the results of the present paper were communicated to the National Academy of Sciences on November 7,1928, see [4].Here and below numbers in square brackets refer to the Bibliography at the end of the paper.f The matrix is of course an infinite square matrix.The word triangular refers to the fact that all the elements above the main diagonal are zero: am" = 0 if n>m.
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Hille et al. (1932) studied this question.
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