Jean van Heijenoort

The fundamental texts of the great classical period in modern logic, some of them never before available in English translation, are here gathered together for the first time. Modern logic, heralded by Leibniz, may be said to have been initiated by Boole, De Morgan, and Jevons. However, it was the publication in 1879 of Gottlob Frege's Begriffsschrift that opened a...