troperville

tools

toys


main index

Narrative

Genre

Media

Topical Tropes

Other Categories

TV Tropes Org
random
Begging The Question

Also called:

  • Petitio principii

"Proving" that something is true by taking your conclusion as one of your premises, usually done implicitly rather than explicitly. Few people are fooled by having your conclusion as your only premise, as in "Joe is mad at Jill, therefore Joe is mad at Jill.". Such arguments are called tautologies and are valid, and sound if the premises are true, but utterly meaningless. Put broadly, this fallacy applies to any argument where one or more premises are at least as contentious as the conclusion itself, and for the same reasons, such as:

Alice says she is honest.
If an honest person says something, it must be true.
Therefore Alice is an honest person, because an honest person says so.

"Begging the question" is often used to mean "leading inevitably to the question" (similar to how something can be said to "invite criticism" or someone can be "asking for a smack") in popular media, though this usage is a common Berserk Button for academics aware of the original use noted above (It doesn't help that the academic meaning is not only horribly counter-intuitivenote , but also a mistranslation). Nevertheless, to avoid confusion, this fallacy is sometimes referred to by its Latin name, petitio principii in more formal settings.

See also No True Scotsman. If you are arguing with someone and each of you thinks the other is Begging The Question, then your definitions are different and/or there is mutual Values Dissonance.


Examples:

Comics
  • A classic Bill Mauldin political cartoon from the early 1960s features an American soldier standing in a field of large cartoon mushrooms, a shout-out to the conical hats worn by Asian field workers and guerrillas, explaining to a comrade the challenge of ground combat in Vietnam: "You got your mushrooms and your toadstools. The mushrooms are harmless, the toadstools will kill you. You'll know it's a toadstool if it kills you."

Video Games
  • Similar to the "mushrooms" example above, in Metal Gear Solid 3, Snake wants to know the difference between two snakes who look very similar, but one of which will poison him if he eats them. Para-Medic suggests an easy way to tell them apart: eat one. If it's poisonous, then he knows it's the poisonous one.

Web Comics

Web Original
  • In the days of Usenet, in a football forum, one poster postulated that you need a great coach to win a Super Bowl. He then defined a "great coach" as one who had won a Super Bowl.

Real Life
  • Watch the TV show Ancient Aliens and marvel at how the proof there were aliens visiting the Earth in the past is how the theory there were aliens that visited the Earth in the past explains problems in history that are problems if you assume there were aliens who visited Earth in the past.
  • There are actually plenty of job postings out there for entry-level positions that require two years of experience.
  • Descartes' so-called "proof" of the existence of God. Raymond Smullyan demonstrated that the only thing really proved by Descartes is that if there are one or more gods who fit Descartes' definition, then their properties must include existence; not that there necessarily is/are such a god or gods.
  • A common "proof" of the existence of God is that The Bible says there's a God. Fair enough on the surface, but pressed on why one should believe the Bible, the most common answer a follower of God will give is, "Because it's God's word and God doesn't lie." Of course, those statements necessarily require that God exist in order for them to be true.

Bandwagon FallacyLogical FallaciesBulverism
Bandwagon FallacyLogic TropesCab Driver's Fallacy
BBC MicroAdministrivia/Useful Notes Pages in MainBellisario's Maxim

random
TV Tropes by TV Tropes Foundation, LLC is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Permissions beyond the scope of this license may be available from thestaff@tvtropes.org.
Privacy Policy
7647
7