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'Fallacy of Assumption' describes a class of formal and informal logical fallacies that are to do with a flaw in an argument's assumptions.
A common example of a fallacy of assumption (there are others) is when someone assumes the very thing they are trying to prove. This is commonly known as begging the question, or petitio principii.
The nature of this fallacy is obvious in the following form:
P1: Fairies Exist
Therefore
C2: Fairies Exist
It's clear that the form of the argument above could be used to 'prove' anything.
As the argument becomes increasingly elaborate, it becomes easier to miss the fallacy.
P1: Fairies Exist
P2: Only fairies can make gardens that are extremely beautiful
P3: My garden is extremely beautiful
Therefore (from P1, P2 and P3)
C1: My garden was made extremely beautiful by fairies
Therefore (from C1)
C2: Fairies Exist
Arguments that commit a fallacy of assumption can easily hide the fallacy by rendering it implicit. This means making a premise in the argument that implies the fallacious assumption without explicitly stating it. In the example immediately above, the statement that 'only fairies can make gardens extremely beautiful' has the assumption that fairies exist built into it. Because of this, P1 can be furtively omitted, giving the logical form below.
P1: Only fairies can make gardens that are extremely beautiful
P2: My garden is extremely beautiful
Therefore (from P1 and P2)
C1: My garden was made extremely beautiful by fairies
Therefore (from C1)
C2: Fairies exist
This argument could be delivered in speech in something like the following manner:
My garden is extremely beautiful. Sure, I work at it. But no one can make a garden this beautiful - no one human, anyway. Only fairies could have done it! I know that fairies had to have made my garden so beautiful, and that's how I know that fairies really exist.
The example may seem silly given the subject matter is fairies. However, arguments of a similar form are very common for other ideas.
Related Questions
The assumption that all pies taste good is a societal fallacy.
Fallacy of consumption is when you assume that all men are endowed with huge cocks ;-p <---------------8
The different types can primarily be categorized in:Ad Hominem (Personal Attack)Bandwagon FallacyFallacist's FallacyFallacy of CompositionFallacy of DivisionGambler's FallacyGenetic FallacyMoralistic FallacyNaturalistic FallacyRed HerringWeak AnalogyAccent FallaciesEquivocation FallacyStraw Man FallacyAffirming the ConsequentArguing from IgnoranceBegging the Question / Circular ReasoningComplex Question FallacyCum Hoc FallacyFalse Dilemma / Bifurcation FallacyHasty Generalisation Fallacy'No True Scotsman' FallacyPost Hoc FallacySlippery Slope FallacySweeping Generalisation FallacySubjectivist FallacyTu Quoque FallacyIrrelevant AppealsAppeal to Antiquity / TraditionAppeal to AuthorityAppeal to ConsequencesAppeal to ForceAppeal to NoveltyAppeal to PityAppeal to PopularityAppeal to PovertyAppeal to Wealth
The adjective form of the word 'fallacy' is fallacious.
A fallacy is a statement that is in error or not correct. "The earth is flat" is a fallacy.
Fallacy means a false belief. His fallacy is that he thinks he's invincible.
The origin of the word fallacy dates back to 1350-1400. The word fallacy means deceptive or misleading. As a simple example, when one says the world is flat it is a complete fallacy.
A fallacy is basically an error in reasoning.
fallacy of positive instances
The naturalist fallacy.
What is a ad hominem genetic fallacy?
The Rhapsodic Fallacy was created in 1984.
Its Semantic Fallacy, Logical Fallacy, and Normative Fallacy.
The word fallacy is similar to the word "fallible" which means that something or someone is wrong. Fallacy is just the state of being wrong so to speak. Googling fallacy shows that it is a false idea or argument that isn't valid.The fallacy of the argument lay in its very idea that trains would one day fly.Not the best sentence maybe, but the best that I can come up with off the top of my head.The opposite of fallacy is actuality but sometimes it's hard to tell which is which.
When people think that the government doesn't have people's best interest in mind it is a fallacy. A fallacy is belief in something that is wrong.
If an argument does not commit a fallacy, it does not necessarily mean that the argument is sound. A fallacy is an argument that uses poor reasoning.
what is a defintion of guilt trip fallacy type?
The red herring fallacy
It is a fallacy that the world is flat.
yes it was a fallacy coz there was no factual evidence.
A fallacy whereby an arguer's refutation is based on a misrepresentation of an opponent's position. (Related to Aristotle's Misconception of Refutation Fallacy)
Fallacy is a general term for unsound logic or unreasonable argument. Stereotype is a particular fallacy; that of illusory correlation.
the fallacy of personal attacks
fallacy of too wide division
The girl wanted to tell the truth but the fallacy made her lie.
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