Présentation de l'éditeur :
These papers, the work of my students, have been so instructive to me, that I have asked and obtained permission to publish them in one volume. Two of them, the contributions of Miss Ladd (now Mrs. Fabian Franklin) and of Mr. Mitchell, present new developments of the logical algebra of Boole. Miss Ladd sarticle may serve, for those who are unacquainted with Boole sL aws ofT hought, as an introduction to the most wonderful and fecund discovery of modem logic. The followers of Boole have altered their masters notation mainly in three respects. 1. A series of writers, Jevons, in 1864; Peirce, in 1867; Grassman, in 1872; Schroder, in 1877; and McC oU in 1877, successively and independently declared in favor of using the sign of addition to unite different terms into one aggregate, whether they be mutually exclusive or not.
(Typographical errors above are due to OCR software and don't occur in the book.)
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