An excerpt from chapter 4 on Objectivity from Objectivism: The Philosophy of Ayn Rand by Leonard Peikoff.
Just as Ayn Rand’s theory of concepts has implications for the rest of epistemology, so other theories of concepts have their own implications. Ayn Rand’s theory leads her to define and demand objectivity in human cognition. Opposite theories lead to the opposite result. Intentionally or otherwise, they lead to the rejection of objectivity.
Historically, the three main theories of concepts are Platonic realism, Aristotelian realism, and nominalism.
Plato held that …
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