critical thinking lecture 7 clear thinking and clear writing by david kelsey
TRANSCRIPT
Critical ThinkingLecture 7
Clear Thinking and Clear Writing
By David Kelsey
Guidelines
• Here are some general guidelines for writing a philosophy paper:
• 1. Your philosophy paper will make an argument.
• 2. The philosophy paper you will write in this course will be of 2 kinds:– a. The positive approach:
– b. The negative approach:
Keep it modest & starting the writing process
• 3. Keep the scope of your paper modest.
• 4. How do you start the paper writing process?– Read and think about it
– Work backwards
Start early &be simple
• 5. Start the paper early, at least a few weeks in advance of the due date.– Finding your thoughts on a subject can be difficult.
• 6. Be Simple:– Simple straightforward prose
Make the structure obvious and Be concise yet fully explain
• 7. Make the structure of your paper obvious:
• 8. Be concise yet fully explain– Cover one or two small points but do fully explore them
Chuck out what’s unnecessary
• 9. Chuck out unnecessary paragraphs:– Each paragraph should be necessary in making your argument
– Each sentence should be a necessary part of its paragraph
– Each word should be a necessary part of its sentence
Avoid vagueness and ambiguity, anticipate objections & editing your draft
• 10. Avoid vagueness and ambiguity.
• 11. Anticipate objections:Imagine the reader of your paper is a devil’s advocate in the worst kind of way.
• 12. Read and re-read your draft
Vagueness
• A vague statement is one whose meaning is indistinct, imprecise or lacks details.
• Degrees: Vagueness isn’t all or nothing. It comes in degrees.– Apartment example
Clarifying vagueness
• Desirable vagueness: sometimes vagueness is actually desirable.– Being Romantic
• Clarify: If we come across a vague statement we can simply try to clarify the lack of detail or indistinct-ness.
– Job example
Vagueness and Propositions
• A vague statement– it is unclear what proposition the sentence asserts at all.
– It could be any one of a number of propositions
Ambiguous Claims
• An ambiguous claim is one that is subject to more than one interpretation.
• Claim x•
– P1 P2
Semantic Ambiguity
• A sentence that is semantically ambiguous is one which contains an ambiguous word or phrase.
• For example:
• Fixing the ambiguous word
Syntactic Ambiguity
• A sentence is syntactically ambiguous when it is ambiguous because of its grammar or the way it has been structured or put together.
• When you have come across a semantic ambiguity you can simply alter the grammar
• Or you might need to re-write the claim altogether.
Grouping Ambiguity
• Grouping ambiguity: – unclear whether some word in the sentence is referring to a group or an
individual.
– Secretaries and Physicians
– Lawnmowers and dirt bikes
Composition and Division
• The fallacy of Division: – When we think that what is true of a
group of things taken collectively is automatically true of the same things taken individually.
– The Giants example:
• The fallacy of Composition: – When we think that what holds for a
group of things individually holds automatically for the entire collective group.
– The Patriots example:
Stipulating Definitions
• Stipulating definitions:– Terms are used that we don’t fully understand.
– A term used is unusual or unfamiliar.
– A brand new word
– A familiar word is being used in a new way
Precising Definitions
• Precising definitions:– Used to reduce vagueness or to eliminate ambiguity.
– Some examples:
• Justice:
• Permissible:
Definitions:by Example & by synonym
• Definition by example:– We define a term by example when we point to, name or describe one or more
examples of something to which the defined term applies.
• Definition by synonym:– We define a term by synonym when we give another word or phrase that means the
same thing as the term being defined.
– Bachelors example
Analytical Definitions: their form
• An Analytical definition is composed of a definiendum and a definiens.– The definiendum:
– The definiens:
• Form: the form of a definition is this:– X =df _____
• Which is the definiendum and which is the definiens?
– For example,
• Knowledge =df true belief
Necessary andsufficient conditions
• We can think of a definition as a set of necessary and sufficient conditions.
• X is a necessary condition of Y if and only if (or iff) we cannot have Y without also having X.
– Oxygen and Combustion
• X is a sufficient condition of Y iff X is all that is needed to get Y.– Being born in the US and citizenship
Necessary and Sufficient Conditions #2
• X is both a necessary and sufficient condition of Y iff both – 1) we cannot have Y without also having X &
– 2) X is all that is needed to get Y.
• Knowledge is JTB
Correct Definitions
• For a definition to be adequate the definiendum and definiens must be co-extensive.
• For the defiendum and definiens of any definition to be co-extensive it must be the case that:
– 1) – 2)
– What is the extension of a concept?
Co-extensiveness:An example
• So if your definition of KNOWLEDGE as TRUE BELIEF is correct then:
– Everything in the extension of KNOWLEDGE is in the extension of TRUE BELIEF and vice versa.
Testing definitions
• To determine if a definition is adequate:– determine if its definiendum and definiens are co-extensive.
– Is there any item in the extension of one that isn’t in the extension of the other?
– Example: Knowledge is true belief
• All Knowledge is true belief.
• All true belief is knowledge.
• Universal generalizations and counterexamples
Counterexamples
• A counterexample: a case that violates a universal generalization.
• If we define knowledge as true belief we just need one counterexample to show this definition inadequate.
– We need to find a case of knowledge that isn’t what?
– Or a case of true belief that isn’t what?
– A counterexample:• The Belief Game:
Counterexamples #2
• Love: Say I define Love as a deep seated feeling composed of compassion & care which one can have for another human being.
– Can anyone find a counterexample to this definition?
• We are looking for either:– a case of love that isn’t ____________
– a case of having this feeling for another human which isn’t ______________
– Any thoughts?