What is a counterargument?
A counterargument is an argument that challenges or opposes another argument, usually by showing that the premises are false, irrelevant, or insufficient, or that the conclusion does not follow from the premises, or that there are better or alternative arguments for a different conclusion. For example, consider this counterargument to the previous argument:
Premise 1: All humans are mortal.
Premise 2: Socrates is a human.
Conclusion: Socrates is mortal.
Counterargument: Premise 2 is false, because Socrates is not a human, but a fictional character invented by Plato.
The counterargument tries to undermine the original argument by denying one of its premises. A counterargument can also challenge the validity or soundness of an argument, which are the two criteria for evaluating arguments. A valid argument is one that has a logical form that guarantees that the conclusion follows from the premises, regardless of their truth value. A sound argument is one that is valid and has true premises. A counterargument can show that an argument is invalid or unsound by exposing a logical flaw or a factual error.