Question: Are The Premises Of A Cogent Argument Always True?

Can a valid argument have all false premises but a true 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.

Since a sound argument is valid, it is such that if all the premises are true then the conclusion must be true..

Can you have an invalid sound argument?

Question originally answered: Can a sound argument be invalid? No, it cannot. A sound argument is defined as a valid argument, with the extra property that the premises of the argument are true. … A valid argument is an argument which has the property that if the premises are true that then the conclusion must be true.

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.

How many premises can an argument have?

two premisesIn logic, an argument requires a set of (at least) two declarative sentences (or “propositions”) known as the “premises” (or “premisses”), along with another declarative sentence (or “proposition”), known as the conclusion. This structure of two premises and one conclusion forms the basic argumentative structure.

Can a cogent argument have 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).

Do all valid arguments have true premises?

All valid arguments have all true premises and true conclusions. All sound arguments are valid arguments. If an argument is valid, then it must have at least one true premise. Every valid argument is a sound argument.

What kind of argument is one in which the conclusion is guaranteed to be true if the premises are true?

deductive argumentA deductive argument is an argument that is intended by the arguer to be deductively valid, that is, to provide a guarantee of the truth of the conclusion provided that the argument’s premises are true.

Can a strong inductive argument have false premises?

Inductively strong arguments cannot have: True premises, false conclusion.

Can a non cogent argument have a true conclusion?

And again, we say that cogent arguments are good. A cogent argument is by definition non-deductive, which means that the premises are intended to establish probable (but not conclusive) support for the conclusion. … And finally, the premises are actually true. So the conclusion indeed receives probable support.

Can an unsound argument have a true conclusion?

No unsound arguments have a true conclusion. T F 4. If it is not possible for the conclusion of an argument to be false, then the argument is valid.

Are all cogent arguments valid?

If a valid argument has a true conclusion, then at least one premise must be true. An argument can be valid and cogent at the same time. All cogent arguments are invalid. All invalid arguments are ill-formed.

Can arguments be true or false?

If an argument is valid, it is a valid deduction, and if its premises are true, the conclusion must be true: a valid argument cannot have true premises and a false conclusion. An argument is formally valid if and only if the denial of the conclusion is incompatible with accepting all the premises.

How can you tell if an argument is 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.

Can a deductive argument have false premises and a true conclusion?

A valid deductive argument cannot have all false premises and a true conclusion. … A valid deductive argument can have all false premises and a false conclusion. 9. Whether an argument is valid has nothing to do with whether any of it’s premises are actually true.

How do you know if an argument is strong or weak?

Generally, strong arguments are ones that are convincing. The logical structure of the premises supports the conclusion and the audience accepts the premises. So a weak argument is one that fails either logically or the person considering the argument doesn’t accept one or more of the premises.

What is a valid but unsound argument?

This argument is valid given that the truth of the premises–if they were true–would guarantee the truth of the conclusion. It is unsound because it doesn’t have all true premises. … It is valid because if the premise were true, the conclusion would necessarily follow.

Can an argument have one premise?

An argument (in the context of logic) is defined as a set of premises and a conclusion where the conclusion and premises are separated by some trigger word, phrase or mark known as a turnstile. For example: 1 I think; therefore I am. There is only one premise in this argument, I think.

What is an unsound argument?

When we are told that an argument is valid, this is not enough to tell us anything about the actual truth or falsity of the premises or the conclusion. … An argument that is not sound is an unsound argument. If an argument is unsound, it might be that it is invalid, or maybe it has at least one false premise, or both.