 He never published a philosophical monograph other than "The Foundations of Arithmetic", much of which was mathematical in content, and the first collections of his writings appeared only after World War II.A volume of English translations of Frege's philosophical essays first appeared in 1952, edited by students of Wittgenstein, Peter Geach (1916–2013) and Max Black (1909–88), with the bibliographic assistance of Wittgenstein (see Geach, ed.1975, Introduction).