|Campbell has a master's degree in mathematics: 'I think writing and doing higher-level mathematics are not completely different. Most of what you do in mathematics is you prove things, you prove theorems. You're showing something is true: you show, using absolutely rigorous mathematical logic, something from beginning to end. In a story, you present a situation and you’re moving through it with a sort of emotional logic. In mathematics it has to be rigorously logical, and fiction needs to be plausible, and interesting enough that people won’t put it down.'