Apparently I am various things simultaneously. My user name implies that I am the great, late, French poststructuralist Jacques Derrida. My avatar is of Sartre in the period following the publication of L'etre et le neant. A quote in my 'sig' is from the eminent German 'existentialist' Martin Heidegger from Being and Time. And, yes, I am studying 'pure' mathematics in Chicago. By the way, Sartre never wrote for the 'screen', as you say.