Girl With An Interesting Fact

Difficulties arise, however, in attempting to identify the constituent parts of negative, modal, disjunctive, or moral facts.
• The fact-value distinction
Moral philosophers since David Hume have debated whether values are objective, and thus factual. In A Treatise of Human Nature Hume pointed out there is no obvious way for a series of statements about what ought to be the case to be derived from a series of statements of what is the case. Those who insist there is a logical gulf between facts and values, such that it is fallacious to attempt to derive values from facts, include G. E. Moore, who called attempting to do so the Naturalistic fallacy.