PositiveThe Guardian (UK)Cheng insists that proper maths, the fun kind, is not about being right, but is a way of thinking differently, and that includes exploring ideas that are impossible according to existing rules. It’s a way of seeing this exhausting debate from a completely new angle ... She does acknowledge, however, that congressive behaviours are currently more common among women, and that society encourages men to be more ingressive. And, though she carefully explains the ways in which anyone can exercise congressive power and influence, a cynical reader is likely to wonder why, even in this egalitarian system, it still seems likely that ingressive people (mostly men) are going to go on making tonnes of money, while congressive people (mostly women) will be putting others first ... Still, if we were ever going to imagine a whole new theory of people, now is as good a time as any to start.