Non Sequitur


A non sequitur, literally ‘it does not follow’ in Latin, is an inference that does not follow from the premises; it is a logical fallacy resulting from a simple conversion of a universal affirmative proposition or from the transposition of a condition and its consequent. All formal logical fallacies are special cases of non sequitur.

“Non sequitur: when a train of thought proceeds from A to B and back again to Q.” – Bill Griffith, Zippy the Pinhead

Simply put, it is a statement that does not follow logically from or is not clearly related to anything previously said; it is an invalid argument in which the conclusion cannot be logically deduced from the premises. For example:

  • It has been very cold this weekend. Global warming is a left-wing conspiracy.
  • Many people consider Jesus their personal saviour. The Bible is completely true.
  • She is a lesbian. She hates men.
  • I lived in a house without a basement; that house flooded. Houses without basements will definitely flood.
  • Wood for furniture comes from trees; trees should not be cut down. Therefore, no new furniture should be produced.
  • If you do not buy this type of dog food, you are neglecting your pet.
  • If evolution is true, why help the poor?
  • God does not believe in atheists, therefore atheists do not exist.
  • If man evolved from monkeys, why are there still monkeys?
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