into to logic
Card Set Information
into to logic
Chapter 1 vocab and questions
Valid arguments can have false premises
A general statement makes a claim about one or more particular members of a class.
Since," "Because" and "Given that" are premise indicators.
A cogent inductive argument is strong and has all true premises.
In an invalid argument we know for certain that the conclusion must be false.
In a valid deductive argument if the premises are true it is impossible for the conclusion to be false.
In the counterexample method needs to rely on a substitution instance with indisputably true premises and an indisputably false conclusion.
Conclusions are used to prove premises.
The horizontal pattern consists of a single argument in which two or more premises provide independent support for a single conclusion.
The counterexample method enables us to prove that an argument is
Extended arguments are easily subjected to logical analysis.
Only if taken together do conjoint premises provide support for a conclusion.
true; conjoint premises support one another. without both of them, the argument doesn't make sense.
A deductive argument is one in which the arguer claims that it is impossible for the premises to be true and the conclusion false.
true; a deductive argument cannot have true premises and a false conclusion.
In a conditional statement the antecedent comes before the consequent
True; if ANTECEDENT then CONSEQUENT
An invalid argument can be sound.
Flase; invalid arguments are always unsound.
A single conditional statement can be an argument.
False; a conditionarl statement can never be an argument because it lacks certain qualities.
A substitution instance is produced by uniformly substituting terms or statements in place of letters in an argument form.
True; if A then B. Not A. Then B.
"Therefore," "Hence" and "Thus" are conclusion indicators