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8942
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Lukasiewicz's L3 logic has three truth-values, T, F and I (for 'indeterminate') [Lukasiewicz, by Fisher]
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Full Idea:
In response to Aristotle's sea-battle problem, Lukasiewicz proposed a three-valued logic that has come to be known as L3. In addition to the values true and false (T and F), there is a third truth-value, I, meaning 'indeterminate' or 'possible'.
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From:
report of Jan Lukasiewicz (Elements of Mathematical Logic [1928], 7.I) by Jennifer Fisher - On the Philosophy of Logic
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A reaction:
[He originated the idea in 1917] In what sense is the third value a 'truth' value? Is 'I don't care' a truth-value? Or 'none of the above'? His idea means that formalization doesn't collapse when things get obscure. You park a few propositions under I.
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5692
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Introspection is not perception, because there are no extra qualities apart from the mental events themselves [Rosenthal]
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Full Idea:
Introspection cannot be a form of perceiving, since that invariably involves sensory qualities, and no qualities occur in introspection other than those of the sensations and perceptions we introspect; there are no additional qualities.
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From:
David M. Rosenthal (Instrospection [1998])
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A reaction:
This sounds pretty conclusive. Presumably introspection is best described as meta-thought rather than perception, which means that it involves beliefs and judgements, rather than new perceptual qualities. It has to be conceptual, and probably linguistic.
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2171
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The 'will' doesn't exist; there is just conclusion, then action [Homer, by Williams,B]
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Full Idea:
Homer left out another mental action lying between coming to a conclusion and acting on it; and he did well, since there is no such action, and the idea is the invention of bad philosophy.
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From:
report of Homer (The Iliad [c.850 BCE]) by Bernard Williams - Shame and Necessity II - p.37
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A reaction:
This is a characteristically empiricist view, which is found in Hobbes. The 'will' seems to have a useful role in folk psychology. We can at least say that coming to a conclusion that I should act, and then actually acting, are not the same thing.
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21819
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Plato says the Good produces the Intellectual-Principle, which in turn produces the Soul [Homer, by Plotinus]
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Full Idea:
In Plato the order of generation is from the Good, the Intellectual-Principle; from the Intellectual-Principle, the Soul.
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From:
report of Homer (The Iliad [c.850 BCE], 509b) by Plotinus - The Enneads 5.1.08
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A reaction:
The doctrine of Plotinus merely echoes Plato, in that case, except that the One replaces the Form of the Good. Does this mean that what is first in Plotinus is less morally significant, and more concerned with reason and being?
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