My question concerns existentialism and determinism. I understand that a "movement" like existentialism is very nebulous and diverse. Many of the thinkers given the name "existentialist" hold varying views on various subjects. But one theme, at least as I understand it, that runs through many existentialist works is the idea of freedom, Sartre's "condemned to be free" for example. From what I understand the sum of an individual is composed of their actions, we are what we do. As such we have a responsibility towards our actions. But I was wondering how some of the major existentialist thinkers would address determinism, specifically determinism based on scientific physical laws. It would seem that if this type of determinism were correct, it would undermine the existentialist view of freedom.