It's like calculus, nothing new in the last years, is it still important? The answer is still "Yes". After a glance, looks like too much for one book. Probably

It's like calculus, nothing new in the last years, is it still important? The answer is still "Yes". After a glance, looks like too much for one book. Probably it was compressed with the assumption that reader already knows quite a lot. In other words it's not an easy reading.