point particle vs particle with structure
in [Relativity]
|
From: BURT on 20 Jul 2010 01:08 On Jul 19, 9:53 pm, Jacko <jackokr...(a)gmail.com> wrote: > On 20 July, 05:36, gulaman <regala...(a)gmail.com> wrote: > > > Some advice > > > 1. Study more elementary physics > > to appreciate that the point particle representation is only for > > convenient solving of physics problems where some factors affecting > > the "particle" are not considered. > > > 2. Study complex analysis and your math > > to know that x/0 is a singularity > > 1. Simplyfying the PDE situation is often a fast engineering solution. > 2. i.e. a/uno/eine/singular/1of - NOT 0. Mass is infinitely concentrated energy in a point of aether in space- time. Mitch Raemsch
From: artful on 20 Jul 2010 02:29 On Jul 20, 2:36 pm, gulaman <regala...(a)gmail.com> wrote: > Some advice > > 1. Study more elementary physics No need > to appreciate that the point particle representation is only for > convenient solving of physics problems where some factors affecting > the "particle" are not considered. That's what I said > 2. Study complex analysis and your math > to know that x/0 is a singularity I understand math just fine, thanks. You can get a mathematical singularity when x=0 in 1/x (for example), that's not the only way, of course. x/0 isn't a singularity as it gives an infinite value for ALL x, not just at a particular x value (ie a singularity). Try again
From: Jacko on 20 Jul 2010 02:31 On 20 July, 06:08, BURT <macromi...(a)yahoo.com> wrote: > On Jul 19, 9:53 pm, Jacko <jackokr...(a)gmail.com> wrote: > > > On 20 July, 05:36, gulaman <regala...(a)gmail.com> wrote: > > > > Some advice > > > > 1. Study more elementary physics > > > to appreciate that the point particle representation is only for > > > convenient solving of physics problems where some factors affecting > > > the "particle" are not considered. > > > > 2. Study complex analysis and your math > > > to know that x/0 is a singularity > > > 1. Simplyfying the PDE situation is often a fast engineering solution. > > 2. i.e. a/uno/eine/singular/1of - NOT 0. > > Mass is infinitely concentrated energy in a point of aether in space- > time. > > Mitch Raemsch No, a spacewarp is. Mass is an effect which can but does not have to occur in the locality of a spacewarp.
From: Jacko on 20 Jul 2010 02:32 On 20 July, 07:29, artful <artful...(a)hotmail.com> wrote: > On Jul 20, 2:36 pm, gulaman <regala...(a)gmail.com> wrote: > > > Some advice > > > 1. Study more elementary physics > > No need > > > to appreciate that the point particle representation is only for > > convenient solving of physics problems where some factors affecting > > the "particle" are not considered. > > That's what I said > > > 2. Study complex analysis and your math > > to know that x/0 is a singularity > > I understand math just fine, thanks. You can get a mathematical > singularity when x=0 in 1/x (for example), that's not the only way, of > course. x/0 isn't a singularity as it gives an infinite value for ALL > x, not just at a particular x value (ie a singularity). > > Try again 0/0 would be? -x/0 would be o wise one?
From: artful on 20 Jul 2010 02:39
On Jul 20, 4:32 pm, Jacko <jackokr...(a)gmail.com> wrote: > On 20 July, 07:29, artful <artful...(a)hotmail.com> wrote: > > > > > > > On Jul 20, 2:36 pm, gulaman <regala...(a)gmail.com> wrote: > > > > Some advice > > > > 1. Study more elementary physics > > > No need > > > > to appreciate that the point particle representation is only for > > > convenient solving of physics problems where some factors affecting > > > the "particle" are not considered. > > > That's what I said > > > > 2. Study complex analysis and your math > > > to know that x/0 is a singularity > > > I understand math just fine, thanks. You can get a mathematical > > singularity when x=0 in 1/x (for example), that's not the only way, of > > course. x/0 isn't a singularity as it gives an infinite value for ALL > > x, not just at a particular x value (ie a singularity). > > > Try again > > 0/0 would be? -x/0 would be o wise one? 0/0 is indeterminate .. it can have any finite value. ie if x = 0/0, then that means 0*x = 0, which is true for any finite value of x. -x/0 and x/0 are infinite when x is non-zero (+ve or -ve as appropriate) None of those are examples of a singularity. Now .. if you said f(x) = 1/x, then you get a singularity at x = 0. Maybe you should stick to subjects you know and understand ... are there any? |