Lewis Carroll (1832-1898) made his name with his Alice books in the 1860s, but also wrote on popular mathematics - he was a maths tutor in various capacities at Christ Church College, Oxford, from his undergraduate days until his death.

First published in 1885, "A Tangled Tale" is a collection of ten brief humorous puzzles - called 'knots' - originally published in a monthly magazine in the early 1880s. Each puzzle is described in story form, then summarised as a 'maths problem'. For the book, Carroll assessed answers sent in by readers, referring to them by name (usually pseudonyms) and grading them, with comments in typically polite-but-cutting Oxford-don fashion.

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