Unit 1 - LOGIC AND FALLACIES Flashcards
What are fallacies?
Flaws and faults that weaken arguments.
What are the two types of fallacies?
Formal and informal
What is a formal fallacy?
A formal fallacy is one which involves an error in the form, arrangement or technical structure of an argument.
What is the structure of an argument?
Premise
Premise
Conclusion
Example of a formally valid argument:
P1: All living things breathe
P2: I breathe
C: I am a living thing
Example of formally invalid argument:
P1: All monkeys have thumbs
P2: I have thumbs
C: I am a monkey
What is deductive logic?
In deductive logic, you draw inferences between information you know for certain and information you need to know.
- If P1 is true then C is true.
What’s the name of a premise-premise conclusion argument?
Syllogism
What is an inductive argument?
An argument in which the conclusion is probably true, given that that premises are true
- Uses percentages or data
What is an abductive argument?
The conclusion is a ‘best guess’ that is judged to be the most plausible explanation among competing alternatives, given that the premises are true.
If it had rained last night, the street would have been wet.
The street is wet
It was raining last night
Attack on the Person
Counters an argument by attacking the person.
“What do you know you’re just a kid.”
Attack on the Motive
Attacks the credibility of a person.
“He doesn’t like that, he just wants to _______!”
Appeal to ignorance
Argues lack of proof arguing against their point. “There isn’t any evidence saying I’m wrong, so I am right.”
Attack to Popularity
When you argue a point is being made just because of the general public.
Improper Appeal to Authority
Using an individual’s unprofessional opinion in your argument as if professional.
Appeal to Emotion
An argument that reaches emotions and feelings.
Appeal to Tradition
An argument that uses tradition to back up their point.
Red Herring
Bringing up an unrelated issue in an argument
Equivocation
A single term with two meanings is used.
Hastey Generalization
Making assumptions about a whole group or range of cases based on an inadequate sample.
Straw Man
Misrepresentation of the other argument
Slippery Slope
A chain reaction of events that are typically improbable.
False Causality
Connections being made between points that don’t relate. (Typically superstitions)
Two Wrongs
When one point should be accepted because another was.