12 ideas
2764 | Full coherence might involve consistency and mutual entailment of all propositions [Blanshard, by Dancy,J] |
Full Idea: Blanshard says that in a fully coherent system there would not only be consistency, but every proposition would be entailed by the others, and no proposition would stand outside the system. | |
From: report of Brand Blanshard (The Nature of Thought [1939], 2:265) by Jonathan Dancy - Intro to Contemporary Epistemology 8.1 | |
A reaction: Hm. If a proposition is entailed by the others, then it is a necessary truth (given the others) which sounds deterministic. You could predict all the truths you had never encountered. See 1578:178 for quote. |
19080 | Coherence tests for truth without implying correspondence, so truth is not correspondence [Blanshard, by Young,JO] |
Full Idea: Blanshard said that coherent justification leads to coherence truth. It might be said that coherence is a test for truth, but truth is correspondence. But coherence doesn't guarantee correspondence, and coherence is a test, so truth is not correspondence. | |
From: report of Brand Blanshard (The Nature of Thought [1939], Ch.26) by James O. Young - The Coherence Theory of Truth §2.2 | |
A reaction: [compression of Young's summary] Rescher (1973) says that Blanshard's argument depends on coherence being an infallible test for truth, which it isn't. |
21110 | An understanding of the most basic physics should explain all of the subject's mysteries [Krauss] |
Full Idea: Once we understood the fundamental laws that govern forces of nature at its smallest scales, all of these current mysteries would be revealed as natural consequences of these laws. | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 08) | |
A reaction: This expresses the reductionist view within physics itself. Krauss says the discovery that empty space itself contains energy has led to a revision of this view (because that is not part of the forces and particles studied in basic physics). |
21105 | In 1676 it was discovered that water is teeming with life [Krauss] |
Full Idea: Van Leeuwenhoek first stared at a drop of seemingly empty water with a microscope in 1676 and discovered in was teeming with life. | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 04) | |
A reaction: I am convinced that this had a huge influence on Leibniz's concept of monads. He immediately became convinced that it was some sort of life all the way down. He would be have been disappointed by the subsequent chemical reduction of life. |
3061 | Anaxarchus said that he was not even sure that he knew nothing [Anaxarchus, by Diog. Laertius] |
Full Idea: Anaxarchus said that he was not even sure that he knew nothing. | |
From: report of Anaxarchus (fragments/reports [c.340 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 09.10.1 |
21109 | Space itself can expand (and separate its contents) at faster than light speeds [Krauss] |
Full Idea: Special Relativity says nothing can travel 'through space' faster than the speed of light. But space itself can do whatever the heck it wants, at least in general relativity. And it can carry distant objects apart from one another at superluminal speeds | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 06) | |
A reaction: Another of my misunderstandings corrected. I assumed that the event horizon (limit of observability) was defined by the stuff retreating at (max) light speed. But beyond that it retreats even faster! What about the photons in space? |
21104 | General Relativity: the density of energy and matter determines curvature and gravity [Krauss] |
Full Idea: The left-hand side of the general relativity equations descrbe the curvature of the universe, and the strength of gravitational forces acting on matter and radiation. The right-hand sides reflect the total density of all kinds of energy and matter. | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 04) | |
A reaction: I had assumed that the equations just described the geometry. In fact the matter determines the nature of the universe in which it exists. Presumably only things with mass get a vote. |
21107 | Uncertainty says that energy can be very high over very short time periods [Krauss] |
Full Idea: The Heisenberg Uncertainty Principle says that the uncertainty in the measured energy of a system is inversely proportional to the length of time over which you observe it. (This allow near infinite energy over very short times). | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 04) | |
A reaction: Apparently this brief energy is 'borrowed', and must be quickly repaid. |
21106 | Most of the mass of a proton is the energy in virtual particles (rather than the quarks) [Krauss] |
Full Idea: The quarks provide very little of the total mass of a proton, and the fields created by the virtual particles contribute most of the energy that goes into the proton's rest energy and, hence, its mass. | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 04) | |
A reaction: He gives an artist's impression of the interior of a proton, which looks like a ship's engine room. |
21112 | Empty space contains a continual flux of brief virtual particles [Krauss] |
Full Idea: Empty space is complicated. It is a boiling brew of virtual particles that pop in and out of existence in a time so short we cannot see them directly. | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 10) | |
A reaction: Apparently the interior of a proton is also like this. This fact gives a foot in the door for explanations of how the Big Bang got started, from these virtual particles. And yet surely space itself only arrives with the Big Bang? |
21108 | The universe is precisely 13.72 billion years old [Krauss] |
Full Idea: We now know the age of the universe to four significant figures. It is 13.72 billion years old! | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 05) | |
A reaction: It amazes me how many people, especially in philosophy, would be reluctant to accept that this is a know fact. I'm not accepting its certainty, but an assertion like this from a leading figure is good enough for me, and it should be for you. |
21111 | It seems likely that cosmic inflation is eternal, and this would make a multiverse inevitable [Krauss] |
Full Idea: A multiverse is inevitable if inflation is eternal, and eternal inflation is by far the most likely possibility in most, if not all, inflationary scenarios. | |
From: Lawrence M. Krauss (A Universe from Nothing [2012], 08) |