If we are taught, not to use double negatives, in school; then why is fiction false and nonfiction not false?

Double negatives refer to negating words: not, never, nothing, nobody, etc. The purpose of this rule is to improve clarity. For example, ';He is not nobody'; or ';I never did nothing'; could mean two different things depending on whether you take one of the negations as a negation or an intensifier.





OTOH, while fiction has an implication of falseness, there is much more to the meaning that just ';not true';. From answers.com: fiction is ';An imaginative creation or a pretense that does not represent actuality but has been invented.';If we are taught, not to use double negatives, in school; then why is fiction false and nonfiction not false?
These things have nothing to do with one another.





A double negative is the result of poor grammar.





Fiction and non-fiction are just words to describe different categories of writing.