# Talk:Universal instantiation

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## Quine

Universal Instantiation and Existential generalization are two aspects of a single principle, for instead of saying that '(x(x=x)' implies 'Socrates is Socrates', we could as well say that the denial 'Socrates≠Socrates' implies '(∃x(x≠x)'. The principle embodied in these two operations is the link between quantifications and the singular statements that are related to them as instances. Yet it is a principle only by courtesy. It holds only in the case where a term names and, furthermore, occurs referentially[1].

Any ideas, remarks, or changes?
--Fan Singh Long (talk) 05:57, 6 February 2012 (UTC)
Ok, since no one has seen fit to leave any comments at all, I will edit the article now.
--Fan Singh Long (talk) 06:42, 13 February 2012 (UTC)

I see no reason for the addition. Inasmuch as it an expression of Quine's philosophical views, it is irrelevant to the article at hand, and inasmuch as it a statement of the logical rules of inference of UI and EG, it is simply superfluous. In short, it would be more appropriately included in the article on Quine.

John Aiello (talk) 04:51, 25 January 2013 (UTC)

## Poor references

These:

1. Copi and Cohen
2. Hurley
3. Moore and Parker
4. pg. 71. Symbolic Logic; 5th ed.

cannot be acceptable references. What by Copi and Cohen, Hurley, and Moore and Parker? — Preceding unsigned comment added by 86.185.221.149 (talk) 13:56, 16 December 2013 (UTC)

1. ^ Quine,W.V.O., Quintessence, Extensionalism, Reference and Modality, P366