double negatives

Double Negative may refer to:

• Double negative, concept in linguistics
• Double negative elimination, logic theory
• Double negation, logic theory p = ~~p; also considered by some to be one of the Laws of Thought
• The Gödel–Gentzen negative translation in proof theory

A double negative is a grammatical construction occurring when two forms of negation are used in the same sentence. Multiple negation is the more general term referring to the occurrence of more than one negative in a clause. In some languages, double negatives cancel one another and produce an affirmative; in other languages, doubled negatives intensify the negation. Languages where multiple negatives affirm each other are said to have negative concord. Portuguese, English, Persian, Russian,  Spanish, Neapolitan and Italian are examples of negative-concord languages, while Latin and German do not have negative concord.