Two Competing Theories of Concepts

Describe the classical theory of concepts using Aristotle's method of definition by genus and differentia.

Explain Ayn Rand's theory of 'measurement omission' as a modern formulation of the classical, essentialist view.

Reconstruct Wittgenstein's 'family resemblance' argument against the classical theory.

Articulate the core metaphysical disagreement between the classical view (realism) and the family resemblance view (conventionalism).