Published online by Cambridge University Press: 15 September 2014
The twenty-year period, 1900–1920, shows a marked increase in the number of writings concerned with persymmetric determinants. There is, it is true, a still greater rate of increase of those of them that belong to the class of “solved questions,” but even taking this into account, we find a growth of interest in the subject that is distinctly striking. And then, too, we must guard carefully against accepting the belief that the members of this solved-question class are uniformly of slight importance, and that the others are never trivial.