> On 28 Oct 2018, at 19:48, [email protected] wrote: > > > > On Sunday, October 28, 2018 at 3:02:27 PM UTC, Bruno Marchal wrote: > >> On 27 Oct 2018, at 17:41, [email protected] <javascript:> wrote: >> >> >> >> On Saturday, October 27, 2018 at 3:20:23 PM UTC, John Clark wrote: >> On Fri, Oct 26, 2018 at 5:40 PM <[email protected] <>> wrote: >> >> > the concept of a plane wave, one of the solutions of Maxwell's equations. >> > It certainly doesn't exist in THIS universe >> >> I agree with the general point you're trying to make, just because something >> can be consistently described mathematically doesn't prove it must exist >> physically. However if you're interested in the waves that enter your radio >> telescope and consider them to be plane waves the error in doing so can be >> made arbitrarily small by increasing the distance from the point source or >> by decreasing the size of the antenna. As a practical matter because the >> things astronomers study are so distant and their antennas are so small they >> can treat the waves they're interested in as plane waves and produce no >> measurable error by doing so. But a designer of optical microscopes would >> not have that luxury because the lens of a microscope is large compared to >> the distance from the sample, so he could not treat them as plane waves. >> >> John K Clark >> >> A spherical wave asymptotically approaches a plane wave as it progresses in >> space and time, but it never becomes a plane wave. This where the rubber >> hits the road for the MUH; we have a mathematical construct that doesn't >> exist in physical reality. > > > Assuming there is a physical reality. Personally I assume only one Turing > universal machinery. I use it to define all the others, and to study the map > of their interfering sharable dreams, hopefully with measure one ([]p & <>t). > > Assuming a physical reality, by default, is not a big deal when doing > physics, but is a very strong assumption when doing metaphysics or theology. > It is a strong ontological commitment, and it is inconsistent with the > mechanist assumption in the cognitive science. > > Doing “theology” with the scientific attitude consist in making clear the > minimal ontological assumption, and building from there. Not coming up with a > “solution” and imposing it like a dogma. > > > > > >> Moreover, since the amplitude along the wave front is a plane, the wave >> changes instantaneously in every direction along the plane for every >> increment of time however small, which I refer to as "instantaneous with a >> vengeance". So, as far as I am concerned the MUH is easily falsified, and >> why it continues to interest people is baffling. AG > > It seems to me that you are the one coming up with extraordinary assumptions, > and tar like if we have succeeded to solve baffling problem with our best > theories (marrying GR and QM), the mind-body problem, etc. > > I have no idea what you're referring to. I simply stated the properties of a > plane wave. Check for yourself. AG
I think I was alluding to your faith in a physical ontology, and to the idea that a plane wave, to exist, has to be physically realised. Bruno > > Bruno > > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/everything-list > <https://groups.google.com/group/everything-list>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
