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All the ideas for 'works', 'works' and 'Paper of December 1676'

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4 ideas

5. Theory of Logic / G. Quantification / 2. Domain of Quantification

17743	De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki]
	Full Idea: In 1846 De Morgan introduced the enormously influential notion of a possibly arbitrary and stipulated 'universe of discourse'. It replaced Boole's original - and metaphysically a bit suspect - universe of 'all things'.
	From: report of Augustus De Morgan (works [1846]) by Michal Walicki - Introduction to Mathematical Logic History D.1.1
	A reaction: This not only brings formal logic under control, but also reflects normal talk, because there is always an explicit or implicit domain of discourse when we talk. Of virtually any conversation, you can say what it is 'about'.

7. Existence / A. Nature of Existence / 6. Criterion for Existence

3534	To be is to have causal powers [Alexander,S]
	Full Idea: To be is to have causal powers.
	From: Samuel Alexander (works [1927], §4), quoted by Jaegwon Kim - Nonreductivist troubles with ment.causation
	A reaction: This is sometimes called Alexander's Principle. It is first found in Plato, and is popular with physicalists, but there are problem cases... A thing needs to exist in order to have causal powers. To exist is more than to be perceived.

17. Mind and Body / A. Mind-Body Dualism / 6. Epiphenomenalism

3398	Epiphenomenalism makes the mind totally pointless [Alexander,S]
	Full Idea: Epiphenomenalism supposes something to exist in nature which has nothing to do and no purpose to serve.
	From: Samuel Alexander (works [1927]), quoted by Jaegwon Kim - Philosophy of Mind p.129
	A reaction: An objection, but not, I think, a strong one. The fact, for example, that sweat is shiny is the result of good evolutionary reasons, but I cannot think of any purpose which it serves. All events which are purposeful are likely to have side-effects.

17. Mind and Body / A. Mind-Body Dualism / 7. Zombies

12727	It's impossible, but imagine a body carrying on normally, but with no mind [Leibniz]
	Full Idea: If it could be supposed that a body exists without a mind, then a man would do everything in the same way as if he did not have a mind, and men would speak and write the same things, without knowing what they do. ...But this supposition is impossible.
	From: Gottfried Leibniz (Paper of December 1676 [1676], A6.3.400), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 5
	A reaction: This is clearly the zombie dream, three centuries before Robert Kirk's modern invention of the idea. Leibniz's reason for denying the possibility of zombies won't be the modern physicalist reason.