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Charles Lutwidge Dodgson, better known as Lewis Carroll, was a mathematician at Oxford University for most of his life. His fanciful “Alice’s Adventures in Wonderland” and “Through the Looking Glass” are quite familiar to us, as, to a lesser extent, are his photographs of young children. In “Lewis Carroll in Numberland,” the distinguished British mathematician Robin Wilson has filled a perceived gap in the writings about Carroll by describing in a straightforward, jabberwocky-free fashion the author’s mathematical accomplishments, both professional and popular.