What Is a Sound Argument

A sound argument is a valid argument that has true premises. A cogent argument is a strong non-deductive argument that has true premises.

How do you identify modus ponens?

Modus Ponens: “If A is true, then B is true. A is true. Therefore, B is true.” Modus Tollens: “If A is true, then B is true.

Is modus ponens a tautology?

In this sense, yes, modus ponens is a tautology. All logic rules that can be stated as sentences of propositional logic are tautologies in the same way. The use of modus ponens in practice is as a rule of inference, rather than as a tautology.