Midterm Exam Flashcards
(43 cards)
An argument
Is a set of statements called premises. Premises comprise a reason for believing a conclusion
In a good argument
The premises support the conclusion
Deductive arguments
Guarantee their conclusions
Ampliative arguments
Make their conclusions probable
Premise
A statement offered in support of a conclusion
Conclusion
The main point of an argument
Validity
An argument is valid just in case if all the premises are true then its conclusion must be true as well
A valid argument has a structure in which the truth of the premises would force the conclusion to be true
Soundness
An argument is sound just in case it is valid and all its premises and conclusion are true
Logical form
The quality of an argument which makes it valid or invalid
Fallacy
An error in reasoning
Hypothetical syllogism (valid)
If A then B
If B then C
If A then C
Modus Tollens
If A then C
Not C
Not A
(Deductive argument)
Modus Pollens
If A then B
B
A
(Inductive argument)
Inductive arguments
All inductive arguments are invalid. They are strong over weak.
Strength: the more likely the conclusion is to be true based on the truth of the premises, the stronger the argument
Strength = validity
Inductive arguments
cannot be sound but can be cogent
Cogency: an inductive argument is cogent when it is both strong and has all true premises
Cogency = soundness
Three main kinds of inductive arguments
Inductive generalization, argument to the best explanation, argument by analogy
Inductive argument ( inductive, generalization)
Two main factors determine the strength of an inductive generalization
1. The size of the sample.
2. The representation or biasedness of the sample.
Inductive argument ( argument to the best explanation)
If A then B
B
A
Inductive argument (argument, analogy)
X and Y have properties a, b and c,
X has property d
Therefore, Y has d as well
Two main factors determine the strength of an analogical argument:
the relevance of the similarities between the two things being compared and the number of relevant similarities identified. The more relevant similarities there are and the stronger the connection between them, the stronger the analogical argument becomes.
Three main theories of knowledge
Foundationalism, Coherentism, Reliabilism
Foundationalism
We acquire knowledge by starting
with basic beliefs and building upon them.
a. Basic beliefs are non-inferentially justified.
b. Problems
i. Which kinds of beliefs count as epistemically
basic?
ii. We may have very little knowledge.
Problem: Tends to lead to skepticism because we wind up
having little knowledge.
Coherentism
A belief counts as knowledge if it is true,
and it has a sufficient amount of support from other
beliefs.
a. Web of justification
b. Two problems
i. It is too permissive (many false beliefs can be
justified this way as well).
ii. Your beliefs could be justified if you were a
brain in a vat.
Reliabilism
A belief counts as knowledge if it is true and was formed by a reliable process.
a. Problem: How do we know which processes are
reliable?
b. Problem?: Violates the KK principle—You can know
X but not know that you know x.
Is Justified True Belief (JTB) enough for knowledge? Consider
the following scenario:
One morning Eleanor is walking through the train station,
having just arrived on her usual commuter train. She
glances up at the big clock in the center of the station and
sees that it says 8:45. Eleanor has noted the time on that
clock on many occasions over the last several years, and it
has always been accurate. So without looking at her watch
or checking the time on her cell phone, Eleanor forms the
belief that it is 8:45. And her belief is true; it is 8:45.
However, at 8:45 the previous evening, the clock broke,
and it has not yet been repaired. So it has said it is 8:45
for the last twelve hours. It is just a lucky accident that
Eleanor happened to glance at the clock at exactly 8:45.
Thus it is just a lucky accident that the belief she formed is
true.1
This is called the Gettier problem, after Edmund Gettier, who
introduced the problem in a famous paper in 1963. It
appears that you can have a justified true belief that isn’t
knowledge. Other examples can be formulated.
Epistemology—three theories
(Foundationalism, Coherentism, Reliabilism)
The study of knowledge.
–What do we know (if anything)?
–What can we know?
–What is required for knowledge?
–What is knowledge?