Henry Maurice Sheffer (1882-1964) was an American logician. Sheffer was a Polish Jew born in the Ukraine, who immigrated to the USA with his parents. He was educated at Harvard University, learning logic at Josiah Royce's feet. Sheffer spent most of his career teaching in Harvard's philosophy department. Scanlan (2000) is a study of Sheffer's life and work. Sheffer proved in 1913 that Boolean algebra could be defined using a single primitive binary operation, "not both. Wikipedia
The definitive Wikipedia entry for Henry M. Sheffer. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Henry_M._Sheffer
The definitive Wikipedia entry for Henry M. Sheffer. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Henry_M%2e_Sheffer