I want to know the answer to the following question:
During his attendance to von Mises' seminars, who did Hayek become friends with?
All the background I'm provided with is that "It was sometime after reading Socialism that Hayek began attending von Mises' private seminars, joining several of his university friends, including Fritz Machlup, Alfred Schutz, Felix Kaufmann, and Gottfried Haberler, who were also participating in Hayek's own, more general, private seminar.". Is that enough to answer the question?