Reasoning Flashcards
Define propositions
Any declarative sentence that expresses something that is either true or false
Define Argument
A series of statements typically used to persuade someone of something or to present reasons for accepting a conclusion
Needs premise and conclusion
Define valid
Deductive correctness
Define sound
When a valid argument has true premises
Define fallacy
A logical mistake in reasoning
2 types of argument and the difference between them
- Deductive: if all of the premises are true, then the conclusion MUST be true (sound)
- Inductive: if all of the premises are true the conclusion MIGHT be true, but is not necessarily true (strong)
Premise indicator words
If
Since
Because
Conclusion indicator words
Thus
Therefore
Hence
Describe 3 different types of fallacies
- Ad Hominem: when an argument is directed at an opponent in a controversy rather than being directly relevant to the argument
- Black and White thinking: a second remark is made as if it logically is followed from the first but has nothing to do with the argument
- Appeal to unsuitable authority: when appealing to some famous person as if they were an expert on the topic being discussed
2 types of definitions
- Analytical: the dictionary definition - the speaker doesn’t want to change the meaning, only wants to characterize the meaning it already has
- Stipulative: purpose is to declare how a speaker intends that certain worked or phrase to be understood ( HEAVY truck - does heavy mean it weights 100 tons or contains more weight than…)
What is meant by a verbal dispute?
A dispute arising solely from the fact that some word is being used with different meanings