Any argument with necessarily false premises
Can a valid argument have false premises and a false conclusion?
A valid argument can have false premises ; and it can have a false conclusion. But if a valid argument has all true premises, then it must have a true conclusion.
Can valid arguments have false conclusions?
FALSE: A valid argument must have a true conclusion only if all of the premises are true. So it is possible for a valid argument to have a false conclusion as long as at least one premise is false .
Do valid arguments always have true conclusion?
FALSE: A valid argument must have a true conclusion only if all of the premises are true . So it is possible for a valid argument to have a false conclusion as long as at least one premise is false. ... A sound argument must have a true conclusion. TRUE: If an argument is sound, then it is valid and has all true premises.
Can a valid argument have a contradiction as a conclusion?
No propositionally valid argument can have a contradiction as a conclusion. Try writing down the truth table to evaluate the following argument: ... Therefore, this argument is an example of one that is propositionally valid, despite the fact that its conclusion is a contradiction.
Can an unsound argument have a true conclusion?
It should be noted that both invalid, as well as valid but unsound, arguments can nevertheless have true conclusions . One cannot reject the conclusion of an argument simply by discovering a given argument for that conclusion to be flawed.
What happens to a conclusion with false premises?
False premises can lead to either a true or a false conclusion even in a valid argument. In these examples, bad luck rather than bad logic led to the false conclusion.
Do all arguments have a conclusion?
FALSE: A valid argument must have a true conclusion only if all of the premises are true . ... Since it is valid, the argument is such that if all the premises are true, then the conclusion must be true. A sound argument really does have all true premises so it does actually follow that its conclusion must be true.
What makes a conclusion valid?
Valid: an argument is valid if and only if it is necessary that if all of the premises are true, then the conclusion is true ; if all the premises are true, then the conclusion must be true; it is impossible that all the premises are true and the conclusion is false. Invalid: an argument that is not valid.
What can an argument with false premises not be?
In the case of an argument which actually has false premises, it takes a short story or fictional work to do this. Such an argument is UNSOUND because the argument does NOT have true premises. ... For either example, the logic is valid but the premises are false. For the premises to be true, all of them need to be true.
What logical conclusion can you draw about an argument that is valid but has a false conclusion?
What logical conclusion can you draw about an argument that is valid but has a false conclusion? This argument must have at lease one false premise
What is a contradictory conclusion?
Contradictory premises involve an argument (generally considered a logical fallacy
Why is an argument with inconsistent premises valid?
Yes. An argument with inconsistent premises is valid, regardless of what the conclusion is. If an argument has inconsistent premises, then it is impossible for all the premises to be true at the same time ; hence it is impossible for all the premises to be true while the conclusion is false.
Can you have a cogent argument with false premises?
To say an argument is cogent is to say it is good, believable; there is good evidence that the conclusion is true. A weak argument cannot be cogent , nor can a strong one with a false premise(s).
What is a valid but unsound argument?
Valid arguments can go wrong by being unsound: an argument is unsound when it is. either invalid or has one or more false premises
Are all persuasive arguments valid?
No, not all persuasive arguments are valid . “To persuade someone of something is to influence her opinion by any number of means, including emotional appeals, linguistic or rhetorical tricks, deception, threats, propaganda, and more. Reasoned argument does not necessarily play any part at all in persuasion” (50).
