TITLE: Ambiguous book titles in Mathematics
QUESTION [5 upvotes]: I fully expect this question to be closed, but I hope it is fun while it lasts.
On my shelf I have a book by Ledermann "Introduction to Group Characters" which could refer to the persona people adopt in groups, and Beardon's "Complex Analysis", which is potentially Freudian.
Are there other mathematical book titles which could belong to completely different disciplines?

REPLY [3 votes]: Surreal numbers (D. E. Knuth, Addison-Wesley, 1974) How misleading!