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3 ideas
6564 | To affirm 'p and not-p' is to have mislearned 'and' or 'not' [Quine] |
Full Idea: To affirm a compound of the form 'p and not-p' is just to have mislearned one or both of these particles. | |
From: Willard Quine (From Stimulus to Science [1995], p.23), quoted by Robert Fogelin - Walking the Tightrope of Reason Ch.1 | |
A reaction: Quoted by Fogelin. This summarises the view of logic developed by the young Wittgenstein, that logical terms are 'operators', rather than referring terms. Of course the speaker may have a compartmentalised mind, or not understand 'p' properly. |
15015 | It seems possible for a correct definition to be factually incorrect, as in defining 'contact' [Sider] |
Full Idea: Arguably, 'there is absolutely no space between two objects in contact' is false, but definitional of 'contact'. ...We need a word for true definitional sentences. I propose: 'analytic'. | |
From: Theodore Sider (Writing the Book of the World [2011], 09.8) |
14981 | Philosophical concepts are rarely defined, and are not understood by means of definitions [Sider] |
Full Idea: Philosophical concepts of interest are rarely reductively defined; still more rarely does our understanding of such concepts rest on definitions. ...(We generally understand concepts to the extent that we know what role they play in thinking). | |
From: Theodore Sider (Writing the Book of the World [2011], 02.1) | |
A reaction: I'm not sure that I agree with this. I suspect that Sider has the notion of definition in mind that is influenced by lexicography. Aristotle's concept of definition I take to be lengthy and expansive, and that is very relevant to philosophy. |