That book sounds Philip K Dick-ish. Is it as good? The plot sounds like it can also go in the direction of the ludicrous. I'd love to read a book about a mathematical revelation but don't think I can take a bad book about mathematics.
I've never read Philip K Dick, so couldn't say. But as I pointed out, this book isn't about mathematics, that's more something tangenital going on in the background. It's about the good and bad in being a human. It's not a 'mathematics saves the day' type book, it's a 'love saves the day' type book.
RE: your other question about Life After Life - I really enjoyed it, but I don't think that means anything as going from your comments on this thread I'm not sure our taste in books crosses over much. Plotlines do develop, but not really one 'overriding' one. Once the main character moves out of home, things do get more interesting though I think.
I agree that the main character herself is largely uninteresting, with uninteresting thoughts. But I think that's part of the point, she is like a blank canvas, it's all the things happening around her that count.