The first chapter of Saramago's The Double is available online.
The book is reviewed by The New York Times and The Washington Post.
Although they acknowledge how ambitious this novel is, it is also flawed — wordy and perhaps a little soulless.
I'm a big fan of Saramago and expect to find this novel under my Christmas tree (there's just too much else on my plate between now and then). I'm sure I'll love it, not least because I don't see the mathematization of characters as a weakness, but I'll let you know for sure in a couple months.