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This book, which forms part of the weaving series from the Nuffield Mathematics Project, is an introduction to logic in a very general sense.

Its main aim was to help students aged from about 8 to 12 to think clearly and logically. In this book, students are encouraged to consider how they use the logically important words, and to express themselves as clearly and unambiguously as possible, but it was not suggested that they should adopt the conventions of mathematical logic in their use of language. For this reason, although 'and' and 'or' and 'not' and 'if' are considered in some detail, truth-tables are not introduced.

The emphasis in this book is on language as it is actually used in everyday life.

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