This is fabulas book. The editor-in-Chief is  Timothy Gowers who need no introduction and June Barrow-Green is an assistant editor (with particular expertise in the history of mathematics). The central focus of the book will be to describe modern pure mathematics, in all its diversity, in a way that is serious, sometimes quite detailed, but always accessible at the lowest possible level. It is very helpful for person like me in particular, who love math and finding ways to study math seriously, as the book take each topic very seriously, trying to be understandable even to the beginner (fundamental definitions are explained clearly with follow up examples) and explanations are given in considerably detail. 


There is a website dedicated to it. To promote this great publication, I have no mean to keep its website secret– PCM. Furthermore, You can get into this site with userid Guest and password PCM (at least it works for this moment, I hope it will be forever).