A good book for those that want an overview

To the mathematically inclined this book has presented value to me so far.

It isnt a book one should expect to read in on session or even in a couple of months of pure devotion. Instead it is material that should be reviewed and digested in conjunction with one's own studies and pursuits. It covers a vast variety of topics found in pure maths, but the real meat that one can chew on is its discourse on the philosophy of maths, techniques used to be a mathematician, and the historical mentions.

Kinda expensive though. 64 bucks.