Appeal to the stone, also known as argumentum ad lapidem, is a logical fallacy that dismisses an argument as untrue or absurd. The dismissal is made by stating or reiterating that the argument is absurd, without providing further argumentation. This theory is closely tied to proof by assertion due to the lack of evidence behind the statement and its attempt to persuade without providing any evidence.
Appeal to the stone is a logical fallacy. Specifically, it is an informal fallacy, which means that it relies on inductive reasoning in an argument to justify an assertion. Informal fallacies contain erroneous reasoning in content of the argument and not the form or structure of it, as opposed to formal fallacies, which contain erroneous reasoning in argument form.