 There are references in the Talmud to a Nechemiah ha`Imsoni, who has been proposed as possibly being the same person as Nachum Ish Gamzu.Nachum was the teacher of Rabbi Akiva, and taught him the exegetical principle of inclusion and exclusion ("ribbui u-mi'uṭ").Only one halakhah of his has been preserved; but it is known that he interpreted the whole Torah according to the rule of "ribbui u-mi'uṭ".