The first 40 pages are a fascinating portrayal of german thought leading up to Frege; not an isolated genius as some would suppose, but as thinker with a radical vision at the junction of mathematics, speculative thought and the emergence of post-naturalism (neo-kantianism, critical empiricism and phenomenology). H. S. Sluga shows the direct philosophical influences on Frege ranging from Lotze, Herbart, Kant and Leibniz -- this book is an incredibly rich look not into merely a thinker, but the genealogy of a new philosophical era.