Question: Are All Valid Arguments True?

Can a valid argument have false premises?

A valid argument can have false premises; and it can have a false conclusion.

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

Since a sound argument also has all true premises, it follows that a sound argument must have a true conclusion.


Are all persuasive arguments valid?

Not all persuasive arguments are valid because they do not all use reasoning to support their claims. Persuasion can be used through deception, threats, and emotional appeal. … However, deductive arguments can be invalid if the premise and the conclusion do not make sense. An example would be; All fish swim.

Can an argument be sound but invalid?

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 is the difference between validity and truth?

In logic, truth is a property of statements, i.e. premises and conclusions, whereas validity is a property of the argument itself. If you talk of ‘valid premises’ or ‘true arguments’, then you are not using logical jargon correctly. True premises and a valid argument guarantee a true conclusion.

Can an unsound argument have a true conclusion?

A sound argument must have a true conclusion. TRUE: If an argument is sound, then it is valid and has all true premises. Since it is valid, the argument is such that if all the premises are true, then the conclusion must be true. … If an invalid argument has all true premises, then the conclusion must be false.

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

A valid deductive argument cannot have all false premises and a true conclusion.

Are the premises of a cogent argument always true?

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.

What makes an argument valid or invalid?

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.

How can you tell 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 does a strong argument look like?

A good argument must: have true premises, be valid or strong, and have premises that are more plausible than its conclusion. 9. If a valid argument has a false conclusion, then one of its premises must be false.

Are all valid arguments sound?

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 type of argument has a conclusion that must be true if its premises are true?

deductive argumentMore specifically, we ask whether the argument is either deductively valid or inductively strong. A 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.