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Showing content with the highest reputation on 02/07/21 in all areas

  1. I'll take a run at this. I think the key issue is that there is no completeness theorem for second-order logic. In general the OP's post doesn't mention the key distinctions between first and second order logic. OP should give this a read, perhaps there is some insight to be had. https://plato.stanford.edu/entries/logic-higher-order/ In particular, note section 5.2: "We shall now see that there is no hope of a Completeness Theorem for second-order logic." Ok, that's a funny way of putting it but I know what you mean. Ok. But you are conflat
    2 points
  2. Stellar aberration’s basic explanation was known since ~1725, which precludes us being at rest with respect to the aether. We had to be moving, but the M-M experiment showed that to be wrong. https://en.wikipedia.org/wiki/Aberration_(astronomy)
    1 point
  3. there's Kahn academy, they walk you through problems step by step with videos and quizzes to test your understanding.
    1 point
  4. Hi bayukutten. I would have thought most maths textbooks for a school Mathematics course for people between about 11 and 15 years of age would have a section on signed numbers (often called positive and negative numbers). I haven't reviewed all of these books so I wouldn't like to single out one book as being better than others. You obviously have internet access. I find the BBC Bitesize educational resources are usually of a high standard and free to access. So I would recommend their site: This is aimed at British key stage 3 (age range 11 to 14): https://www.
    1 point
  5. Or you take the engineering approach and just read-off provided numbers: https://globalsolaratlas.info/map. If I remember correctly, the tool even has a "mark an area and integrate" functionality. I'd like to say something constructive here. But I find it hard to make out what this thread is about, or to add anything meaningful on this very vague level. I mean: Yes, solar panels generate electricity. Yes, you can put them on rooftops. And yes, there is lots of sun in the equatorial regions. And to Swansont's post: Yes, there are problems in detail. Transport and storage are somewha
    1 point
  6. First, that is a very incomplete reading of how SARS-CoV-2 affects our bodies. Damages are not exclusively to cytokine storms, and there has been some discussions whether it is really relevant to the observed damages. There seems to be an association with severity but then there is also the question of the triggers. That being said, there are always interactions with the immune system in vivo but it is not the sole source of damage. What is known is that the virus attacks several organs, including the brain stem and at in vitro studies show that cellular damages also occur. Moreover, the
    1 point
  7. It doesn't matter if you are an atheist or a believer. What really matters if you are a good *) person.. I know many good atheists, and many evil to the core, believers (claiming, pretending or fooling themselves, to be good).. *) The problem is that for different people "being good" means something else.. For instance, moral behaving like having regular sex without marriage, for religious extremists and fanatics, means being evil. At the same time they cut heads of disbelievers, murder people, force people to abandon their religion, impose their views on others, terroriz
    1 point
  8. The atoms or if I use as an example the water molecules pretty much absorb light of all wavelength ranging from radio wave to gamma ray(perhaps), the important part is you want to lock the atom in place, like trying to stop a spinning globe in place, so if the wavelength is too long, like if I touch the globe once every second, it would not stop as oppose to using an x-ray(the shorter the wavelength the better), the thing is it needs to be applied in equal from six directions(if not 8), or else it would get push around in the opposite direction of the laser. So alignment is very important.
    -1 points
  9. ARE WE GOING ABOUT COVID-19 THE WRONG WAY Should we not be developing a vaccine that tells our immune systems to ignore the virus, not fight it. After all the virus can't harm us, our own immune systems do that by cytokine storms and leaving infected part of the body to fight the virus that can't harm us any how. we are festooned with viruses that have took millions of years for us to ignore.
    -1 points
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