A posteriori identification of normativity with natural properties (as in Jackson's analytical functionalism) collapses into the very descriptivism Hare showed fails to capture prescriptivity.

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Hare(as the philosopher whose theory is being discussed): R.M. Hare was a 20th-century British philosopher who developed a theory about how moral language works, arguing that when we make moral judgments we're really giving prescriptions (like commands or recommendations) about how people should act.
Jackson's analytical functionalism(a specific position in philosophy of mind and ethics): Frank Jackson's philosophical theory that mental states and moral properties can be completely explained by breaking them down into their physical, natural components.
Prescriptivity(One of Hare's two key formal features of moral language): The formal feature of moral judgments by which they function as action-guiding prescriptions that commit the speaker, rather than mere descriptions of fact
a posteriori(Used to classify the epistemic status of necessary statements post-Kripke): Knowable, but not independently of empirical experience

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