Critical Thinking Flashcards
(41 cards)
What is Critical thinking?
Employs argument rather than rhetoric
What is an argument?
A set of statements linked in a particular way ,it will have one or more premises and one conclusion which is the end point
What are the premises intended to do?
Provide support for the conclusion
What is the aim of an argument?
To establish the truth of a statment
What is validity?
If the premises were true the conclusion would have to be true
it would be impossible for all the premises to be true and the conclusion false
Could there be a valid argument with false premises and a true conclusion ?
Yes
Socrates is an Elephant
All elephants are Greek
Socrates is Greek
Could there be a valid argument with true premises and a false conclusion?
No
In no possible circumstances could the premises be true and the conclusion false
A useful method for showing that an argument is invalid
The method of counter example
How can we be sure that the conclusion of an argument is really true?
Is the argument valid?
Are its premises actually true?
only when answer yes in both occasions do we have grounds to accept the conclusion
When is an argument sound?
A valid argument with true premises
An argument is said to be deductively valid iff…
It is logically impossible for the premises to be true and the conclusion false.
An argument is inductively strong iff…
the truth of the premises makes the truth of the conclusion probable but does not guarantee it
To say that an argument is inductively sound is to say..
It is inductively strong and its premises are actually true
Why is deductive logic monotonic?
the more premises you add the more conclusions you may draw
Why is inductive logic non monotonic?
sometimes a conclusion is made less probable by new info
What is an antecedent?
The sentence which forms the if part
What is the consequent?
The sentence which forms the then part
What is a sufficient condition?
The truth of the first statement would guarantee the truth of the second statement.The truth of the first one is all you need ,sufficient enough to ensure the truth
E.G
Having your head cut off is a sufficient condition for being dead.There are many other ways to die ,but decapitation is sufficient enough to ensure it.
What is a necessary condition?
The truth of the first statement is required or necessary for the truth of the second.
E.G
Paying your tuition fees is a necessary condition for graduating.If you are to graduate you must pay your fees but you also need to do a few other things as well like pass exams
What is the layout of a Modus Ponens argument
A- B
A
C= B
What is the layout of Fallacy of affirming the consequent
A- B
A
C =A
What is the layout of the Fallacy of denying the antecedent
A -B
NOT A
C=NOT B
What is the layout of Modus Tollens
A-B
NOT B
C=NOT A
How can we demonstrate the fallacies
Using the counter example technique