21821
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Plato's Parmenides has a three-part theory, of Primal One, a One-Many, and a One-and-Many [Plato, by Plotinus]
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Full Idea:
The Platonic Parmenides is more exact [than Parmenides himself]; the distinction is made between the Primal One, a strictly pure Unity, and a secondary One which is a One-Many, and a third which is a One-and-Many.
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From:
report of Plato (Parmenides [c.364 BCE]) by Plotinus - The Enneads 5.1.08
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A reaction:
Plotinus approves of this three-part theory. Parmenides has the problem that the highest Being contains no movement. By placing the One outside Being you can give it powers which an existent thing cannot have. Cf the concept of God.
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15691
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Children accept real stable categories, with nonobvious potential that gives causal explanations [Gelman]
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Full Idea:
By five children assume that a variety of categories have rich inductive potential, are stable over outward transformations, include crucial nonobvious properties, have innate potential, privilege causal features, can be explained causally, and are real.
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From:
Susan A. Gelman (The Essential Child [2003], 06 'Intro')
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A reaction:
This is Gelman's helpful summary of the findings of research on childhood essentialising, and says the case for this phenomenon is 'compelling'.
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