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33 Cards in this Set

  • Front
  • Back
What is logic
-study of the techniques we use to distinguish good from bad reasoning
Argument

Ethyneme
series of statements that the conclusion follows from the premises

argument with an unstated premiss or conclusion
Statement
-chain or assertion that something is or is not so
Different types of sentences
-statement (I rule)
-question(Do I rule?)
-command(Go rule!)
-performative utterance(I promise to rule)
What is the essential difference between inductive/deductive
one neccessatates, the other is probable
Inductive argument
-Claim conc. are only probable
-Conclusions "go beyond" prems
-Concl. might be false, even if prems are true
-Req. something between no evidence and complete evidence
-Marbles, opinions
Deductive argument
-claim conc. are necessary
-conc. do not go beyond prems
-concl. cannot be false, if prems are true
Strength of inductive?
-depends on how far beyond the prems the conc. goes
-not really concerned with it in here
Valid argument?

Invalid argument
-If the prems are true, then the conc. must be true. Determined only by form.

-If the prems are true, it is possible for the conc. to be false
Sound argument
-If argument is valid, and the prems are indeed are true
Key words for premises

Concl
-because, since, as, for, for the reason that, is shown by

-so, thus, therefore, hence, accordingly
Psychological mistake
-psychological factor independent of logic, but an appeal psychologically
Argumentum ad Bacalum
Hominem
Ignorantium
-appeal to force
-to the man, a punk gives an argument, say just look at him! or priest arguing for god
-from ignorance, you can't prove it is not the case, so it is the case
Populum
Misericordium
Verecundiam
-to the people=bandwagoning
-to pity=due to misfortune, plea for help
-to authority="learned" people's arguments are better just because of that, not because of anything else
Post Hoc Ergo Propter Hoc

Black or white fallacy
-after the thing=association is causation. I played video games, then I kill somebody, so they must be linked

-either/or. but ridiculous and not clear premises. If I don't pass this test I will die
Petitio Principii
-begging the question. Just restating the premiss, so logical valid but says nothing. Also could be circular argument.
-You should study logic because you ought to learn techniques for good reason
Complex question (fallacy)
-basing question on assumption, also a kind of begging the question. Kind of a set up question
-why did you rob the bank? Are you embarrased that you cheated?
Accident/Converse accident
-taking something sound and applying it accidently to every situation (stealing, giving a weapon back to a drunk person)
-hasty generalization. It is good to not let your friends drive drunk, so it is good to not let frineds drive
Division and composition
-deal with wholes and parts.
-division=say character of one whole applies to the parts (metallica rules, so every song rules)
-comp=opposite(every song rules, so Metallica rules)
Equivocation

Amphiboly
-when words have more than one meaning, applying it to all (right=the right to do, and right=good)
-if statement taken intended different than it was taken (John said Mary come here)
Classes
-groups or collections of things which have in common some quality or charecteristic.
-ex. dogs, brown dogs, brown things
-Must use nouns or noun phrases: run is not, but runners is...
Categorical propositions

Standard form
-statements that have classes that relate to each other.
1) must talk about two classes, S and P
2) say whether S included in P or excluded from P
Types of standard forms
-All S are P=Universal Affirmitive (A)
-No S are P=Universal Negative (E)
-Some S are P=Particular Affirmitive (I)
-Some S are not P=Part. Negative (O)
-Each has quantity (uni/par) and quality (affirm/neg)
Form for
Distribution of term
-Quantifier-Subject-Copula-Predicate
A=All Sd are Pu
E=No Sd are Pd
I=Some Su are Pu
O=Some Su are not Pd
Square of opposition:

Contradictories
Contraries
Subcontraries
Subalternates
A-O, E-I. opposite truth values
A-E. If one is true other is false:but if one is false, other is unknown
I-O. One is false, other is true:if one is true, other is unknown
A-I, E-O. T moves down, not up. F Moves Up, not down (E-O)
conversion
obversion
contraposition
-Switching S & P
-All S are P->No S are non-P
No S are P to all S are non-P

-All S are P--> All non-P are non-S
All S are P are T/F, A

To E, I, O
-E If T, F. If F, Unknown

-I If T, T. If False, Unknown

-O Opposite
No S are P T/F, E

To others
-A If T, F. If F, Unknown

-O If T, T. If False, Unknown

-I Opposite
Some S are P T/F, I

To others
-O If F, T. If T, Unknown

-A If T, Unknown. If F, F

-E Oppostite
Some S are not P T/F, O

To others
-I If F, T. If T, Unknown

-E If F, F. If T, Unknown

-A Opposite
Can a prop be true if it doesn't exist?

Existential Import?
-No, but if it is hypothetical, then yes

-If class has no members (unicorns), do not accept argument
What must be agreed upon for something to be statement
-Verifibility or how you would verify it
Moods?

Types of figures?
-AEE, EIO, AIO, etc.

- M-P P-M M-P P-M
S-M S-M M-S M-S