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337 Beacon of Hope

About DrRocket

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  • College Major/Degree
    BS,MS electrical engr / PhD mathematics
  • Favorite Area of Science
    mathematics and physics

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  1. I like your posts. Please accept my humble friend request.

  2. - This has nothing to do with taking a derivtive, by any method. [math] \lim_{n \to -1} \frac{n^2 - 1}{n + 1} [/math] = [math] \lim_{n \to -1} \frac{(n - 1)(n+1)}{n + 1}=-2 [/math] I think you need to go back and understand limits a bit better. Then and only then are you ready to understand derivatives. You are concentrating on calculating and "finding the answer" when you need to concentrate on what the concepts mean.
  3. One more time. Within the context of general relativity, there are NO singular points in spacetime (aka the universe). Therefore the statemetn that "the universe began as a singularity" is meaningless. The singularity theorems of Penrose and Hawking show that it is impossible to indefinitely continue timelike geodesics into the past. That is the sense in which there is no "before" the big bang. Quite a few people who write popularizations, including physicists who one would think should know better, do not understand this point. Perhaps they too ought read the original papers by
  4. Trying to do differential geometry, group theory, linear algebra, and tensor calculus simultaneously is neither realistic nor logical. You need to understand linear algebra thoroughly before you undertake differential geometry or tensor calculus. In fact you need a good deal more to study those subjects, including basic real analysis and topology. Also, Schaum's outllines are not the best way to study advanced subjects. They are intended as supplements to other material, a set of lectures or a text, and tend to emphasize symbol pushing over fundamental understanding. This is appar
  5. This is nonsense, word salad. You need to learn some physics.
  6. The electromagnetic force does not "function in an environment where there is no light". But you must realize that the term "light" in the context of physics includes ALL frequencies, not just visible light. Your eyes are sensitive to only a very small part of the entire electromagnetic spectrum. There are electromagnetic waves just about everywhere, else your cell phone would not work and it certainly does work in a "dark" room. Moreover, at the quantum level the carrier of the electromagnetic force is actually a virtual photon rather than a real photon. The electrostatic force,
  7. It you call that "published" then you are in need of much higher standards. If an organ publishes anything then nothing that it publishes can be assumed to be of value without a good deal more research into what the paper says. There is a reason that high-value scientific papers are publilshed in peer-reviewed journals with high standards and a high rejection rate.
  8. I think you can safely ignore most things from Davies.
  9. There have been a number of attempts to model space as discrete. They have not panned out. There is still ongoing research involving other approaches to model space as discrete. They may eventually bear fruit, but they have not done so yet. Since there is not viable theory that is based on discrete space, there is no sensible to forsee what might result from a future theory that is based on such a picture of space. I doubt that this lack of clarity will be much of a barrie to those who purvey speculation as science in the popular literature. Ask Michio Kaku if rank speculation is
  10. Eneergy conservation in general relativity is a bit of a problem. Energy can be shown to be conserved locally -- at any single point. But energy is not necessarily conserved over a non-zero volume. So there is no global conservation of energy law in general relativity. This is not as serioius an issue as you might think since enrgy conservation is normally thought of as applying between two instants of time, and there is not such thing as global time in general relativity either. To compound that problem, gravitational potential energy is not clearly defined in general relativity.
  11. The definition of distance is not one bit "better" or more fundamental than the definition of time.
  12. There are lols of books on complex analysis. At an introductory to intermediate level there is new one that is very good -- Complex Variables by Joseph L. Taylor. It is published by the American Mathematical Society and therefore is relatively inexpensive (in the expensive realm of math and science books). There is a discount for members. At a somewhat higher level there is Real and Complex Analysis by Walter Rudin, which contains a lot more than just complex analysis. Then there a number of older classic books which are still extremely good: Theory of Functions of a Compl
  13. Yep. Now, if the process were that of an "intelligent designer" rather than that messy evolutioin thing, then perhaps the color would be different. Or maybe it is just a matter of being green with envy.
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