Logic - Valid, Sound, Modus Ponens, Modus Tollens, Fallacies and Contradictions

What is denying the antecedent?

A logical fallacy of the form: If p then q no p therefore, no q

What is affirming the consequent?

A logical fallacy of the form: If p then q Q Therefore, p

What is a contradiction?

A statement that can never be logically true.

What is modus tollens?

A valid argument of the form: If p then q No q Therefore, no p

What is an example of sound?

All cats are mammals. Sophie is a cat. Therefore, Sophie is a mammal.

What is an example of a valid argument?

All men drink coffee. John is a man. Therefore, John drinks coffee.

How do you know if an argument is sound?

An argument is sound if it is valid and its premises are true.

What is a logical fallacy?

An error in reasoning that leads to an invalid conclusion.

What is an example of a contradiction?

I am a snail and not a snail.

What is modus ponens?

If P then Q P Therefore Q

What is an example of modus ponens?

If Yara is a cat, then she is a bird. Yara is a cat. Therefore, she is a bird.

How do you know if an argument is valid?

If the conclusions follow the premises

What is an example of denying the antecedent?

If there is fire, then there is smoke No fire Therefore, no smoke.

What is an example of affirming the consequent?

If there is fire, then there is smoke. There is smoke. Therefore, there is fire.

Is Modus Ponens valid or invalid?

valid