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Ideas for 'works', 'The Theory of Logical Types' and 'Causality and Properties'

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2 ideas

5. Theory of Logic / E. Structures of Logic / 1. Logical Form

4730	For Aristotle, the subject-predicate structure of Greek reflected a substance-accident structure of reality [Aristotle, by O'Grady]
	Full Idea: Aristotle apparently believed that the subject-predicate structure of Greek reflected the substance-accident nature of reality.
	From: report of Aristotle (works [c.330 BCE]) by Paul O'Grady - Relativism Ch.4
	A reaction: We need not assume that Aristotle is wrong. It is a chicken-and-egg. There is something obvious about subject-predicate language, if one assumes that unified objects are part of nature, and not just conventional.

5. Theory of Logic / E. Structures of Logic / 5. Functions in Logic

21566	'Propositional functions' are ambiguous until the variable is given a value [Russell]
	Full Idea: By a 'propositional function' I mean something which contains a variable x, and expresses a proposition as soon as a value is assigned to x. That is to say, it differs from a proposition solely by the fact that it is ambiguous.
	From: Bertrand Russell (The Theory of Logical Types [1910], p.216)
	A reaction: This is Frege's notion of a 'concept', as an assertion of a predicate which still lacks a subject.