[andrewl]

Martin Gardner’s The Annotated Alice explains the subtleties, mathematical and otherwise, of both Alice books in engaging detail. It explained things I never understood, and showed me things I missed (and then explained them). Besides the mathematics there are references to politicians and events of the era, and jokes that would be known only to people at Oxford.

[coldpie]

Oh excellent, my library has a copy available right now. I will go check this out :)

[srean]

I would suggest you checkout all of Martin Gardner from that library if you can. He is sorely missed, by me at the least.