The book Spinoza includes a foreword by a philosopher born in which year ?
A. J. Ayer: Sir Alfred Jules "Freddie" Ayer, FBA ( ; 29 October 1910 – 27 June 1989), usually cited as A. J. Ayer, was a British philosopher known for his promotion of logical positivism, particularly in his books "Language, Truth, and Logic" (1936) and "The Problem of Knowledge" (1956).
i don't know