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Logic Definitions Chapter 1
definitions for chapter one
55
Philosophy
Undergraduate 2
07/13/2009

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Term
logic
Definition
the science that evaluates arguments
Term
argument
Definition
a group of statements, one or more of this (the premises) are claimed to provide support for, or reasons to believe, one of the others (the conclusion).
Term
statement
Definition
a sentence that is either true or false
Term
premise
Definition
a statement in an argument that sets forth evidence
Term
conclusion
Definition
the statement in an arument that the premises are claimed to support or imply
Term
conclusion indicator
Definition
a word that provides a clue to identifying a conclusion
Term
premise indicator
Definition
a word that provides a clue to identifying the premise
Term
inference
Definition
the reasoning process expressed by an argument
Term
proposition
Definition
the information content of a statement
Term
syllogisitc
Definition
a deductive argument consisting of two premises and one conclusion
Term
syllogisitic logic
Definition
the logic that deals with categorical propositions and categorical syllogisitic.
Term
modal logic
Definition
a kind of logic that deals with concepts such 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
a claim that alleged evidence or reasons support or imply something
Term
warning
Definition
a form of expression intended to put someone on guard against a dangerous or detrimental situation
Term
piece of advice
Definition
a form of expressing that makes a recommendation about some future decision or course of conduct
Term
statement of belief/opinion
Definition
a kind of nonargument composed of statements that express the personal conviction of a speaker or writer without giving any evidence in support of that conviction
Term
loosely associated statements
Definition
statements that are about the same general subject and that lack an inferential relationship
Term
report
Definition
a kind of nonargument consisting of one or more statements that convey information about some topic or event
Term
expository passage
Definition
a kind of dicourse 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
an argument that purports to prove something by giving one or more examples of it
Term
explanation
Definition
an expression that purports to shed light on some event or phenomenon
Term
explanandum
Definition
the component of an explanation that describes the event or phenomenon to be explained
Term
explanan
Definition
the component of an explanation that describes the event or phenomenon indicated by the explanandum
Term
conditional statement
Definition
an "it...then" statement
Term
antecedent
Definition
the component of a conditional statement immediately following the word "if"
Term
consequent
Definition
the component of a conditional statement immediately following the word "then"
Term
particular statement
Definition
a statement that makes a claim about one or more (but not all) members of a class
Term
general statement
Definition
a statement that makes a claim about all the members of a class
Term
prediction
Definition
an inductive argument that proceeds from knowledge of some event in the relative past to a claim about some other event in the relative future
Term
argument from analogy
Definition
an inductive argument that depends on the existence of a similarity between two things or states of affairs
Term
generalization
Definition
an inductive argument that proceeds from the knowledge of a selected sample to some claim about the whole group
Term
argument from authority
Definition
an inductive argument in which the conclusion rests on the statement made by some presumed authority or witness
Term
argument based on signs
Definition
an inductive argument that proceeds from the knowledge of a sign to a claim about the things or situation that the sign symbolizes
Term
casual inference
Definition
an inductive inference that proceeds from knowledge of a cause to a claim about an effect, or from knowledge of an effect to a claim about a cause
Term
argument from definition
Definition
a deductive 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 all three statements are categorical propositions
Term
hypothetical syllogism
Definition
a syllogism having a conditional statement for one or both of its premises
Term
disjunctive syllogism
Definition
a syllogism having a disjunctive statement for one or both of its premises - a valid argument form/rule of inference: "p or q / not p//q"
Term
argument based on mathematics
Definition
a deductive argument in which the conclusion depends on some purely arithmetic or geometric computation or measurement
Term
deductive argument
Definition
an argument incorporation the claim that is is impossible for the conclusion to be false given that the premises are true
Term
inductive argument
Definition
an argument incorporation the claim that is is improbable that the conclusion is false given that the premises are true
Term
necessary conditon
Definition
the condition represented by the consequent in a conditional statement
Term
sufficient condition
Definition
the condition represented by the antecedent in a conditional statement
Term
valid deductive argument
Definition
an argument in which is it impossible for the conclusion to be false given that the premises are true
Term
invalid deductive argument
Definition
a deductive argument in which it is possible for the conclusion to be false given that the premises are true
Term
strong inductive argument
Definition
an inductive argument in which it is umprobable that the conclusion be false given that the premises are true
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
weak inductive argument
Definition
an inductive argument in which the conclusion does not follow probably from the premises even though it is claimed to do so
Term
cogent argument
Definition
an inductive argument that is strong and has all true premises
Term
uncogent argument
Definition
an inductive argument that is weak, has one or more false premises, or both
Term
substitution instance
Definition
an argument or statement that has the same form as a given argument for or statement form
Term
counterexample method
Definition
a method for proving invalidity; consists in constructing a subsititution instance having true premises and false conclusion
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