5 ideas
10792 | The substitutional quantifier is not in competition with the standard interpretation [Kripke, by Marcus (Barcan)] |
Full Idea: Kripke proposes that the substitutional quantifier is not a replacement for, or in competition with, the standard interpretation. | |
From: report of Saul A. Kripke (A Problem about Substitutional Quantification? [1976]) by Ruth Barcan Marcus - Nominalism and Substitutional Quantifiers p.165 |
490 | Everything happens by reason and necessity [Leucippus] |
Full Idea: Nothing happens at random; everything happens out of reason and by necessity. | |
From: Leucippus (fragments/reports [c.435 BCE], B002), quoted by (who?) - where? |
22593 | Our sensation of light may not be the same as what produces the sensation [Descartes] |
Full Idea: There can be a difference between our sensation of light and what is in the objects that produce that sensation in us. | |
From: René Descartes (The World [1631]), quoted by Ian Dunt - How to be a Liberal 1 | |
A reaction: Note only that they 'may' differ, and that he does not assert that they are entirely different. Secondary qualities give information, and are not just mental events. |
16569 | The Hot, Cold, Wet and Dry of the philosophers need themselves to be explained [Descartes] |
Full Idea: If you find it strange that in explaining these elements I do not use the qualities called Hot, Cold, Wet and Dry - as the philosophers do - I shall say to you that these qualities themselves seem to me to need explanation. | |
From: René Descartes (The World [1631], 9:25-6), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 1.3 | |
A reaction: Nice. I take pushing the boundaries of explanation back (or down) to be the basic driving force of all human thought, in metaphysics as well as in physics. |
20964 | Descartes said there was conservation of 'quantity of motion' [Descartes, by Papineau] |
Full Idea: Descartes incorporated the conservation of what he called 'quantity of motion', by which he meant mass times speed. | |
From: report of René Descartes (The World [1631]) by David Papineau - Thinking about Consciousness App 2 | |
A reaction: Mass times velocity is now called 'momentum'. Is this the first ever conservation law? There are now lots of them. |