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Chapter 1
A Concise Introduction to Logic, 10th ed., Patrick J. Hurley, Chapter 1
55
Philosophy
Undergraduate 2
09/06/2010

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Term
argument
Definition
a group of statements, one or more of which (the premises) are claimed to provide support for one of the others (the conclusion).
Term
statement
Definition
sentence that is either true or false
Term
truth value
Definition
true or false
Term
premise
Definition
statements that set forth the reasons or evidence
Term
conclusion
Definition
statement that the evidence is claimed to support or imply
Term
conclusion indicators
Definition
therefore, wherefore, thus, consequently, we may infer, accordingly, we may conclude, it must be that, for this reason, so, entails that, hence, it follows that, implies that, as a result
Term
premise indicators
Definition
since, as indicated by, because, for, in that, may be inferred from, as given that, seeing that, for the reason that, inasmuch as, owing to
Term
inference
Definition
reasoning process expressed by an argument
Term
proposition
Definition
the meaning or information content of a statement
Term
syllogistic logic
Definition
a kind of logic in which the fundamental elements are terms, and arguments are evaluated as good or bad depending on how the terms are arranged in the argument.
Term
modal logic
Definition
involves such concepts as possibility, necessity, belief, and doubt
Term
factual claim
Definition
a claim that something is true; a claim that evidence or reasons are being presented
Term
inferential claim
Definition
the passage expresses a certain kind of reasoning process; something supports or implies something or that something follows from something.
Term
warning
Definition
form of expression that is intended to put someone on guard against a dangers or detrimental situation.
Term
piece of advice
Definition
form of expression that makes a recommendation about some future decision or course of conduct.
Term
statement of belief/opinion
Definition
expression about what someone happens to believe or think about something.
Term
loosely associated statements
Definition
may be about the same general subject, but lack a claim that one of them is proved by the others
Term
report
Definition
consists of a group of statements that convey information about some topic or event.
Term
expository passage
Definition
kind of discourse that begins with a topic sentence followed by one or more sentences that develop the topic sentence.
Term
illustration
Definition
an expression involving one or more examples that is intended to show what something means or how it is done.
Term
arguments from example
Definition
illustrations that can be taken as arguments
Term
explanation
Definition
an expression that purports to shed light on some event or phenomenon.
Term
explanandum
Definition
statement that describes the even t or phenomenon to be explained
Term
explanans
Definition
statement or group of statements that purports to do the explaining
Term
conditional statement
Definition
if... then... statement
Term
antecedent
Definition
if component
Term
then
Definition
then component
Term
sufficient condition
Definition
the occurrence of A is all that is needed for the occurrence of B
Term
necessary condition
Definition
A cannot occur without the occurrence of B
Term
deductive argument
Definition
an argument incorporating the claim that it is impossible for the conclusion be false given that the premises are true; necessary reasoning
Term
inductive argument
Definition
an argument incorporating the claim that is improbable that the conclusion be false given that the premises are true; probabilistic reasoning
Term
argument based on mathematics
Definition
an argument in which the conclusion depends on some purely arithmetic or geometric computation or measurement
Term
categorical syllogism
Definition
an argument in which the conclusion is claimed to depend merely on the definition of some word or phrase used in the premise or conclusion
Term
categorical syllogism
Definition
a syllogism in which each statement begins with one of the words all, no, or some.
Term
hypothetical syllogism
Definition
a syllogism having a conditional statement for one or both of its premises.
Term
disjunctive syllogism
Definition
a syllogism having disjunctive statement (i.e., an either... or... statement) for one of its premises
Term
prediction
Definition
an argument that proceeds from our knowledge of the past to a claim about the future.
Term
argument from analogy
Definition
an argument that depends on the existence of an analogy, or similarity, between two things or states of affairs
Term
generalization
Definition
an argument that proceeds from the knowledge of a selected sample to some claim about the whole group
Term
argument from authority
Definition
an argument that concludes something is true because a presumed expert or witness has said that it is
Term
argument based on signs
Definition
an argument that proceeds from the knowledge of a sign to claim about the thing or situation that the sign symbolizes
Term
casual inference
Definition
an argument that proceeds from knowledge of a cause to a claim about an effect, conversely, from knowledge of an effect to a claim about a cause
Term
particular statement
Definition
one that makes a claim about one or more particular members of a class
Term
general statement
Definition
makes a claim about all the members of a class
Term
valid deductive argument
Definition
an argument in which it is impossible for the conclusion to be false given that the premises are true; conclusion follows with strict necessity from the premises
Term
invalid deductive argument
Definition
an argument in which it is possible for the conclusion to be false given that the premises are true; conclusion does not follow with strict necessity from premises
Term
sound argument
Definition
a deductive argument that is valid and has all true premises
Term
unsound argument
Definition
a deductive argument that is invalid, has one or more false premises, or both
Term
strong inductive argument
Definition
an inductive argument in which it is improbable that the conclusion be false given that the premises are true
Term
weak inductive argument
Definition
an argument in which the conclusion does not follow probably from the premises, even though it is claimed to
Term
cogent argument
Definition
an inductive argument that is strong and has all true premises; both conditions must be present
Term
uncogent argument
Definition
an inductive argument that is weak, has one or more false premises, or both.
Term
argument form
Definition
an arrangement of words and letters such that the uniform substitution of terms or statements in place of the letters results in an argument
Term
substitution instance
Definition
any argument that is produced by uniformly substituting terms or statements in place of the letters in an argument form
Term
counterexample method
Definition
a substitution instance having true premises and a false conclusion
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