The Theory of Groups is a branch of mathematics in which one does something to something and then compares the result with the result obtained from doing the same thing to something else, or something else to the same thing. ↗
The social sciences, I thought, needed the same kind of rigor and the same mathematical underpinnings that had made the "hard" sciences so brilliantly successful. ↗
Most were beginning to feel they had learned enough to last for the rest of their lives. They remained mathematicians, but largely went their own way. ↗