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Hume's fork is the idea that all items of knowledge are based either on logic and definitions, or else on observation. If the is–ought problem holds, then "ought" statements do not seem to be known in either of these two ways, and it would seem that there can be no moral knowledge. Moral skepticism and non-cognitivism work with such conclusions.
Definitional retreat – changing the meaning of a word when an objection is raised. [23] Often paired with moving the goalposts (see below), as when an argument is challenged using a common definition of a term in the argument, and the arguer presents a different definition of the term and thereby demands different evidence to debunk the argument.
The term naturalistic fallacy is sometimes used to label the problematic inference of an ought from an is (the is–ought problem). [3] Michael Ridge relevantly elaborates that "[t]he intuitive idea is that evaluative conclusions require at least one evaluative premise—purely factual premises about the naturalistic features of things do not entail or even support evaluative conclusions."
For example, if our resources maximize utility through charitable contributions rather than spending them on ourselves, we are, according to utilitarianism, morally required to do so. The objection holds that this clashes with our intuitions about morality, since we would normally consider such acts to be " supererogatory " (praiseworthy but ...
For example, an invalid inference "Because everybody ought to be equal, there are no innate genetic differences between people" is an instance of the moralistic fallacy. Where the naturalistic fallacy attempts to move from an "is" to an "ought" statement, the moralistic fallacy attempts to move from an "ought" to an "is" statement.
Typically, a deontic logic uses OA to mean it is obligatory that A (or it ought to be (the case) that A), and PA to mean it is permitted (or permissible) that A, which is defined as . In natural language, the statement "You may go to the zoo OR the park" should be understood as P z ∧ P p {\displaystyle Pz\land Pp} instead of P z ∨ P p ...
ought – the "is" and "ought" problem involves terms that go back to Kant, Hume, and others. Kelsen preferred the ought (Sollen) or an ought proposition (Sollsatz) to norm because of the latter's dual sense of both descriptive (e.g., some behavior "is the norm", which Kelsen does not use) and prescriptive social norms. [7]
Aristotle's intended meaning is closely tied to the type of dialectical argument he discusses in his Topics, book VIII: a formalized debate in which the defending party asserts a thesis that the attacking party must attempt to refute by asking yes-or-no questions and deducing some inconsistency between the responses and the original thesis.