This is a book of short stories by Greg Egan, one of the most successful Australian sci-fi writers of all time.
I'm already a fan, having read "Luminous", another book of short stories, as well as "Permutation City" and "Quarantine". I also have "Diaspora" on my shelf, but I haven't read it yet. Shortly. Shortly.
I thought that "Luminous" was great - there were at least three or four really good short stories in there, including "Reasons to be Cheerful", probably my favorite ever short story, and "Mitochondrial Eve", a close second.
Because "Axiomatic" is older, I expected it to be less polished and less interesting. I was completely wrong. Almost every story was amazing in some way.
I highly recommend this for intellectual sci-fi fans. Don't miss Egan, we aren't going to see anything this good for a long, long time.