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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.
The fact–value distinction is closely related to, and derived from, the is–ought problem in moral philosophy, characterized by David Hume. [3] The terms are often used interchangeably, though philosophical discourse concerning the is–ought problem does not usually encompass aesthetics. [4]
The demandingness objection is a common [1] [2] argument raised against utilitarianism and other consequentialist ethical theories. The consequentialist requirement that we maximize the good impartially seems to this objection to require us to perform acts that we would normally consider optional.
Hume's strong empiricism, as in Hume's fork as well as Hume's problem of induction, was taken as a threat to Newton's theory of motion. Immanuel Kant responded with his Transcendental Idealism in his 1781 Critique of Pure Reason, where Kant attributed to the mind a causal role in sensory experience by the mind's aligning the environmental input by arranging those sense data into the experience ...
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.
The problem is similar with respect to the supervenience of normative facts on natural facts. Discussing the is-ought problem it is agreed that facts about how persons ought to act are not entailed by natural facts but cannot vary unless natural facts vary, and this rigid binding without entailment might seem puzzling.
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."